Yosemite 10.10.3 update has my iMac running very slow

I'm on a iMac from late 2013
with a 3.5 ghz intel core i7
16GB of memory
3T of available storage
Updated Yosemite 10.10.3 a few days ago, and my problems started.
I get a spinning pinwheel after nearly everything I do, and especially while navigating finder windows
I've done disk verify actions, reset PRAM, and cleaned up a few misbehaving applications ... namely firefox.
I have a very limited iTunes catalog
I don't use iCloud, or iPhoto, and subsequently the new Photos app
- as I organize and back up this material manually
- though the apps remain on my computer
Nothing looks out of order in looking at activity monitor
I do some iPhone connective things
--- like the Messages App
--- but don't thoroughly sync my machines
--- perhaps there is something weird happening there?
Open to other ideas of what I might be able to do before reinstalling my OS in hopes that it works better.

John,
I am having the same issue that etcetera1 is having. It started about 2 months ago.
Here are my specs:
iMac 27-inch, Mid 2011
3.1 GHz Intel Core i5
16GB 1333 Mhz DDR3
AMD Radeon HD 6970M 2048 MB
1 TB Hard Drive with over half of the space left on it.
If it is the hard disk; what type should i replace it with?
Thanks,
~Mike. :-)
Here are the messages that I'm getting displayed:
Marker - Apr 22, 2015, 7:26:08 PM
Apr 22 19:26:22 --- last message repeated 1 time ---
Apr 22 19:26:22 Mike-Fernandess-iMac.local com.apple.WebKit.Plugin.64[487]: Failed to connect (colorGridView) outlet from (NSApplication) to (NSColorPickerGridView): missing setter or instance variable
Apr 22 19:26:22 Mike-Fernandess-iMac.local com.apple.WebKit.Plugin.64[487]: Failed to connect (view) outlet from (NSApplication) to (NSColorPickerGridView): missing setter or instance variable
Apr 22 19:26:24 Mike-Fernandess-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): The _DirtyJetsamMemoryLimit key is not available on this platform.
Apr 22 19:26:40 Mike-Fernandess-iMac.local com.apple.WebKit.Plugin.64[489]: Failed to connect (colorGridView) outlet from (NSApplication) to (NSColorPickerGridView): missing setter or instance variable
Apr 22 19:26:40 Mike-Fernandess-iMac.local com.apple.WebKit.Plugin.64[489]: Failed to connect (view) outlet from (NSApplication) to (NSColorPickerGridView): missing setter or instance variable
Apr 22 19:26:41 Mike-Fernandess-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): The _DirtyJetsamMemoryLimit key is not available on this platform.
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.3 instead of 10.10.3. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.
Call location:
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 0   CarbonCore                          0x90704291 ___Gestalt_SystemVersion_block_invoke + 135
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 1   libdispatch.dylib                   0x975ba0b5 dispatch_once_f + 251
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 2   libdispatch.dylib                   0x975bb0d8 dispatch_once + 31
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 3   CarbonCore                          0x9067d69d _Gestalt_SystemVersion + 1050
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 4   CarbonCore                          0x9067c7c0 Gestalt + 150
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 5   MicrosoftComponentPlugin            0x01c743be McpInitLibrary_ + 505
Apr 22 19:26:57 Mike-Fernandess-iMac.local Microsoft Excel[491]: 6   MicrosoftComponentPlugin            0x01c741ee McpInitLibrary_ + 41
Apr 22 19:27:08 Mike-Fernandess-iMac kernel[0]: disk0s2: I/O error.
Apr 22 19:27:18 --- last message repeated 1 time ---
Apr 22 19:27:18 Mike-Fernandess-iMac systemstatsd[416]: assertion failed: 14D136: systemstatsd + 3283 [B963831F-0CDB-3587-AF0A-44A28CE58E47]: 0xa
Apr 22 19:27:27 Mike-Fernandess-iMac kernel[0]: disk0s2: I/O error.
Apr 22 19:27:37 --- last message repeated 1 time ---
Apr 22 19:27:37 Mike-Fernandess-iMac systemstatsd[416]: assertion failed: 14D136: systemstatsd + 3322 [B963831F-0CDB-3587-AF0A-44A28CE58E47]: 0xa
Apr 22 19:29:41 Mike-Fernandess-iMac.local sandboxd[276] ([464]): mdworker(464) deny file-read-data /Users/MikeFernandes/Library/Preferences/com.apple.security.plist (import fstype:hfs fsflag:480D000 flags:250000025E diag:0 isXCode:0 uti:com.apple.application-bundle plugin:/Library/Spotlight/Application.mdimporter - find suspect file using: sudo mdutil -t 12148559)
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: WARNING: The Gestalt selector gestaltSystemVersion is returning 10.9.3 instead of 10.10.3. Use NSProcessInfo's operatingSystemVersion property to get correct system version number.
Call location:
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 0   CarbonCore                          0x90704291 ___Gestalt_SystemVersion_block_invoke + 135
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 1   libdispatch.dylib                   0x975ba130 _dispatch_client_callout + 50
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 2   libdispatch.dylib                   0x975ba0b5 dispatch_once_f + 251
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 3   libdispatch.dylib                   0x975bb0d8 dispatch_once + 31
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 4   CarbonCore                          0x9067d69d _Gestalt_SystemVersion + 1050
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 5   CarbonCore                          0x9067c7c0 Gestalt + 150
Apr 22 19:29:51 Mike-Fernandess-iMac.local battle.net[508]: 6   battle.net                          0x006a4b84 GetBattlenetAllocator + 6743236
Apr 22 19:29:52 Mike-Fernandess-iMac.local battle.net[508]: The function ‘CGFontSetShouldUseMulticache’ is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance.
Apr 22 19:29:54 Mike-Fernandess-iMac.local WindowServer[129]: Display 0x42801c0 captured by conn 0x18323
Apr 22 19:29:54 Mike-Fernandess-iMac.local universalAccessAuthWarn[522]: AccessibilityAPI: pid 518, is not allowed to access the accessibility API. Path: /Applications/StarCraft II/Versions/Base32283/SC2.app/Contents/MacOS/SC2
Apr 22 19:30:01 Mike-Fernandess-iMac.local SC2[518]: kAudioUnitErr_TooManyFramesToProcess : inFramesToProcess=1024, mMaxFramesPerSlice=256
Apr 22 19:30:48 Mike-Fernandess-iMac kernel[0]: disk0s2: I/O error.
Apr 22 19:30:57 --- last message repeated 1 time ---
Apr 22 19:30:57 Mike-Fernandess-iMac systemstatsd[416]: assertion failed: 14D136: systemstatsd + 3283 [B963831F-0CDB-3587-AF0A-44A28CE58E47]: 0xa
Apr 22 19:31:07 Mike-Fernandess-iMac kernel[0]: disk0s2: I/O error.
Apr 22 19:31:16 --- last message repeated 1 time ---
Apr 22 19:31:16 Mike-Fernandess-iMac systemstatsd[416]: assertion failed: 14D136: systemstatsd + 3322 [B963831F-0CDB-3587-AF0A-44A28CE58E47]: 0xa
Apr 22 19:31:25 Mike-Fernandess-iMac.local WindowServer[129]: Display 0x42801c0 released by conn 0x18323
Apr 22 19:31:25 Mike-Fernandess-iMac.local WindowServer[129]: Display 0x42801c0 captured by conn 0x18323
Apr 22 19:31:25 Mike-Fernandess-iMac.local WindowServer[129]: Display 0x42801c0 released by conn 0x18323
Apr 22 19:31:32 Mike-Fernandess-iMac.local thermald[44]: invalid attribute or value, default to yes
Apr 22 19:31:36 --- last message repeated 3 times ---
Apr 22 19:31:36 Mike-Fernandess-iMac kernel[0]: bird[247] Unable to quarantine: 93
Apr 22 19:32:27 Mike-Fernandess-iMac.local CalendarAgent[253]: [com.apple.calendar.store.log.caldav.queue] [Account refresh failed with error: Error Domain=CoreDAVHTTPStatusErrorDomain Code=401 "The operation couldn’t be completed. (CoreDAVHTTPStatusErrorDomain error 401.)" UserInfo=0x7fb1f71d71b0 {AccountName=Yahoo!, CalDAVErrFromRefresh=YES, CoreDAVHTTPHeaders=<CFBasicHash 0x7fb1f25a0870 [0x7fff7b016ed0]>{type = immutable dict, count = 6,
entries =>
0 : Server = ATS
1 : Www-Authenticate = <CFString 0x7fb1f72154a0 [0x7fff7b016ed0]>{contents = "Basic realm="YahooCalendar"
Apr 22 19:32:27 Mike-Fernandess-iMac.local CalendarAgent[253]: [com.apple.calendar.store.log.caldav.queue] [Adding [<CalDAVAccountRefreshQueueableOperation: 0x7fb1f2589000; Sequence: 0>] to failed operations.]
Apr 22 19:32:29 Mike-Fernandess-iMac.local CalendarAgent[253]: [com.apple.calendar.store.log.caldav.queue] [Account refresh failed with error: Error Domain=CoreDAVHTTPStatusErrorDomain Code=401 "The operation couldn’t be completed. (CoreDAVHTTPStatusErrorDomain error 401.)" UserInfo=0x7fb1f4d775c0 {AccountName=Yahoo!, CalDAVErrFromRefresh=YES, CoreDAVHTTPHeaders=<CFBasicHash 0x7fb1f5747e40 [0x7fff7b016ed0]>{type = immutable dict, count = 6,
entries =>
0 : Server = ATS
1 : Www-Authenticate = <CFString 0x7fb1f5747620 [0x7fff7b016ed0]>{contents = "Basic realm="YahooCalendar"
Apr 22 19:32:29 Mike-Fernandess-iMac.local CalendarAgent[253]: [com.apple.calendar.store.log.caldav.queue] [Adding [<CalDAVAccountRefreshQueueableOperation: 0x7fb1f25e2400; Sequence: 0>] to failed operations.]

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Hardware Information:
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          1 2.66 GHz Intel Core i7 CPU: 2 cores
          4 GB RAM
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          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
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                    EFI (disk0s1) <not mounted>: 209.7 MB
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          MATSHITADVD-R   UJ-898
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FireWire Information:
Thunderbolt Information:
Kernel Extensions:
          com.paceap.kext.pacesupport.snowleopard          (5.7.2)
Problem System Launch Daemons:
          [failed] com.apple.softwareupdated.plist
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Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist
          [loaded] com.adobe.SwitchBoard.plist
          [loaded] com.google.keystone.daemon.plist
          [loaded] com.intego.BackupAssistant.daemon.plist
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          [failed] com.intego.task.manager.daemon.plist
          [failed] com.intego.VirusBarrierX6.daemon.plist
          [failed] com.intego.VirusBarrierX6.scanner.daemon.plist
          [loaded] com.iobit.AMCDaemon.plist
          [loaded] com.paceap.eden.licensed.plist
          [loaded] com.sibelius.sari.plist
          [loaded] PACESupport.plist
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.adobe.CS5ServiceManager.plist
          [loaded] com.google.keystone.agent.plist
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User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.adobe.ARM.[...].plist
          [failed] com.iobit.AMCUpdate.plist
          [failed] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist
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User Login Items:
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3rd Party Preference Panes:
          BrowserPlus
          Flash Player
          Flip4Mac WMV
          Growl
          NetUpdate
Internet Plug-ins::
          DirectorShockwave: Version: 11.5.9r620
          o1dbrowserplugin: Version: 4.9.1.16010
          Default Browser: Version: 537 - SDK 10.9
          Flip4Mac WMV Plugin: Version: 2.3.8.1
          OfficeLiveBrowserPlugin: Version: 12.3.3
          SlingPlayer: Version: (null)
          Silverlight: Version: 5.1.20513.0 - SDK 10.6
          FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6
          Flash Player: Version: 11.9.900.170 - SDK 10.6
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          googletalkbrowserplugin: Version: 4.9.1.16010
          npgtpo3dautoplugin: Version: 0.1.44.29 - SDK 10.5
          AdobePDFViewer: Version: 9.5.5
          QuickTime Plugin: Version: 7.7.3
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
User Internet Plug-ins::
          WebEx64: Version: 1.0 - SDK 10.6
Bad Fonts:
          None
Old applications:
          Authorizer:          Version: 1.0.5 - SDK 10.4
                    /Applications/Authorizer.app
          BackupAssistantAgent:          Version: 1.1 - SDK 10.5
                    /Library/StartupItems/Intego Backup Assistant/BackupAssistantAgent.app
          Intego Backup Assistant:          Version: 1.1 - SDK 10.5
                    /Applications/Intego Backup Assistant.app
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                    /Applications/Intego Backup Assistant Uninstall.app
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                    /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
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                    /Users/pchopz23/Library/Application Support/WebEx Folder/500/Network Recording Player.app
          SLLauncher:          Version: 1.0 - SDK 10.5
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          smcFanControl:          Version: 2.3 - SDK 10.4
                    /Users/pchopz23/Desktop/Files /smcFanControl_2_3/smcFanControl.app
Time Machine:
          Skip System Files: NO
          Auto backup: YES
          Volumes being backed up:
                    Macintosh HD: Disk size: 464.96 GB Disk used: 194.34 GB
          Destinations:
                    LaCie [Local] (Last used)
                    Total size: 465.44 GB
                    Total number of backups: 2
                    Oldest backup: 2013-10-25 16:20:43 +0000
                    Last backup: 2013-10-25 17:00:46 +0000
                    Size of backup disk: Too small
                              Backup size 465.44 GB < (Disk used 194.34 GB X 3)
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          All volumes being backed up may not be listed.
Top Processes by CPU:
               3%          WindowServer
               1%          EtreCheck
               0%          Google Chrome
               0%          coreservicesd
               0%          notifyd
Top Processes by Memory:
          131 MB          Twitter
          94 MB          Google Chrome
          67 MB          Google Chrome Helper
          37 MB          Finder
          37 MB          com.apple.WebKit.WebContent
Virtual Memory Statistics:
          97 MB          Free RAM
          617 MB          Active RAM
          527 MB          Inactive RAM
          893 MB          Wired RAM
          3.86 GB          Page-ins
          101 MB          Page-outs

Ok yeah I'm done using Chrome and I am pretty sure I got rid of Clean My Mac 2.
With Intego I brought up the uninstaller program and there was nothing to select to take it off though.
Hardware Information:
          MacBook Pro (15-inch, Mid 2010)
          MacBook Pro - model: MacBookPro6,2
          1 2.66 GHz Intel Core i7 CPU: 2 cores
          4 GB RAM
Video Information:
          Intel HD Graphics - VRAM: 288 MB
          NVIDIA GeForce GT 330M - VRAM: 512 MB
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
Startup Items:
          PACESupport: Path: /Library/StartupItems/PACESupport
System Software:
          OS X 10.9 (13A603) - Uptime: 0 days 9:36:32
Disk Information:
          Hitachi HTS545050B9SA02 disk0 : (500.11 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 499.25 GB (290.21 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          MATSHITADVD-R   UJ-898
USB Information:
          Apple Inc. BRCM2070 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Internal Memory Card Reader
          Apple Inc. Apple Internal Keyboard / Trackpad
          Apple Inc. iPhone
          Apple Computer, Inc. IR Receiver
          Apple Inc. Built-in iSight
FireWire Information:
Thunderbolt Information:
Kernel Extensions:
          com.paceap.kext.pacesupport.snowleopard          (5.7.2)
Problem System Launch Daemons:
          [failed] com.apple.softwareupdated.plist
          [failed] com.apple.wdhelper.plist
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist
          [loaded] com.adobe.SwitchBoard.plist
          [loaded] com.google.keystone.daemon.plist
          [loaded] com.intego.BackupAssistant.daemon.plist
          [failed] com.intego.commonservices.daemon.plist
          [loaded] com.intego.commonservices.icalserver.plist
          [failed] com.intego.netupdate.daemon.plist
          [failed] com.intego.task.manager.daemon.plist
          [failed] com.intego.VirusBarrierX6.daemon.plist
          [failed] com.intego.VirusBarrierX6.scanner.daemon.plist
          [loaded] com.iobit.AMCDaemon.plist
          [loaded] com.paceap.eden.licensed.plist
          [loaded] com.sibelius.sari.plist
          [loaded] PACESupport.plist
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.adobe.CS5ServiceManager.plist
          [loaded] com.google.keystone.agent.plist
          [loaded] com.intego.backupassistant.agent.plist
          [loaded] com.intego.netupdate.agent.plist
          [loaded] com.intego.task.manager.notifier.plist
          [failed] com.intego.VirusBarrierX6.alert.plist
          [failed] com.intego.VirusBarrierX6.statusitem.plist
User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist
          [loaded] com.adobe.ARM.[...].plist
          [failed] com.iobit.AMCUpdate.plist
          [loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist
          [not loaded] com.user.UninstallAD.plist
User Login Items:
          SpeechSynthesisServer
          IntegoStatusItemHelper
3rd Party Preference Panes:
          BrowserPlus
          Flash Player
          Flip4Mac WMV
          Growl
          NetUpdate
Internet Plug-ins::
          DirectorShockwave: Version: 11.5.9r620
          o1dbrowserplugin: Version: 4.9.1.16010
          Default Browser: Version: 537 - SDK 10.9
          Flip4Mac WMV Plugin: Version: 2.3.8.1
          OfficeLiveBrowserPlugin: Version: 12.3.3
          SlingPlayer: Version: (null)
          Silverlight: Version: 5.1.20513.0 - SDK 10.6
          FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6
          Flash Player: Version: 11.9.900.170 - SDK 10.6
          iPhotoPhotocast: Version: 7.0
          googletalkbrowserplugin: Version: 4.9.1.16010
          npgtpo3dautoplugin: Version: 0.1.44.29 - SDK 10.5
          AdobePDFViewer: Version: 9.5.5
          QuickTime Plugin: Version: 7.7.3
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
User Internet Plug-ins::
          WebEx64: Version: 1.0 - SDK 10.6
Bad Fonts:
          None
Old applications:
          Authorizer:          Version: 1.0.5 - SDK 10.4
                    /Applications/Authorizer.app
          BackupAssistantAgent:          Version: 1.1 - SDK 10.5
                    /Library/StartupItems/Intego Backup Assistant/BackupAssistantAgent.app
          Intego Backup Assistant:          Version: 1.1 - SDK 10.5
                    /Applications/Intego Backup Assistant.app
          Intego Backup Assistant Uninstall:          Version: 1.0.5 - SDK 10.5
                    /Applications/Intego Backup Assistant Uninstall.app
          Microsoft AutoUpdate:          Version: 2.3.6 - SDK 10.4
                    /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
          Network Recording Player:          Version: 2.2.0 - SDK 10.5
                    /Users/pchopz23/Library/Application Support/WebEx Folder/500/Network Recording Player.app
          SLLauncher:          Version: 1.0 - SDK 10.5
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          smcFanControl:          Version: 2.3 - SDK 10.4
                    /Users/pchopz23/Desktop/Files /smcFanControl_2_3/smcFanControl.app
Time Machine:
          Skip System Files: NO
          Auto backup: YES
          Volumes being backed up:
                    Macintosh HD: Disk size: 464.96 GB Disk used: 194.68 GB
          Destinations:
                    LaCie [Local] (Last used)
                    Total size: 465.44 GB
                    Total number of backups: 2
                    Oldest backup: 2013-10-25 16:20:43 +0000
                    Last backup: 2013-10-25 17:00:46 +0000
                    Size of backup disk: Too small
                              Backup size 465.44 GB < (Disk used 194.68 GB X 3)
          Time Machine details may not be accurate.
          All volumes being backed up may not be listed.
Top Processes by CPU:
               4%          Twitter
               3%          WindowServer
               1%          EtreCheck
               0%          notifyd
               0%          com.apple.WebKit.Networking
Top Processes by Memory:
          143 MB          Twitter
          82 MB          Safari
          45 MB          Finder
          33 MB          WindowServer
          29 MB          EtreCheck
Virtual Memory Statistics:
          207 MB          Free RAM
          690 MB          Active RAM
          353 MB          Inactive RAM
          911 MB          Wired RAM
          4.35 GB          Page-ins
          116 MB          Page-outs

3 year old iMac running very slow, freezing all the time. Advice?

My three year old iMac - 2.4Ghz processor, 2GB RAM, running Lion - is becoming almost totally useless. For many months it has been very slow, with multiple freezes, and then "force quits" on iPhoto and other applications.
First, I tried to free up some space - i now have about 44GB free. Then I ran disk utility etc, Then I ugraded to Lion.
But still I'm getting the same problems. Any suggestions?

It sounds like your problems are more serious than a 'hardware upgrade' issue. My late 2008 MacBook 2.4GHz with 2GB RAM runs applications (and iPhoto) fine. In addition I have run OS X operating systems with little more than 5GB free hard drive space with no issue (being able to run advanced applications like Photoshop).
My advice- if you have simply upgraded to Lion keeping all your systems settings and files intact then you may want to perform a 'clean install', you'll backup your important data/files in order to transfer them back again into Lion. You could even create a Time Machine Backup and use this to move only your data and applications back into your clean install of OS X Lion.

2008 iMac running very slow...why?!

My 2008 iMac started running very slowly yesterday, taking ages to start up and showing the spinning wheel on the desktop for ages making it impossible to do anything. It particularly doesn't like running iTunes or Spotify and got worse when I plugged my iPod in. Another thing I can think of is I downloaded an album from iTunes yesterday and this seemed to coincide with it having a breakdown. Chrome is also running slow and I get frequent unresponsive script messages.
I'm running OS X 10.5.8 and have upgraded to iTunes 10.6.1. I recently installed the Flashback removal software. Anyone got ideas as to why my computer might suddenly be behaving like this? Don't fancy an expensive trip to the Genuis Bar! Thank v v much.

Hi...
How much free space on the startup disk?
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 15% free disk space.
Freeing Up Hard Disk Space - Mac GuidesFreeing Up Hard Disk Space - Mac Guides
Since it's so slow to startup, remove any items in System Preferences > Accounts > Login Items
If there's enough free disk space and removing any items from the Login Items pane didn't help, the startup disk may need repairing.
Using Disk Utility to verify or repair disks

Late 2013 iMac running very slow

EVERYTHING is running slow. My iphoto screensaver keeps freezing, all apps open super slow (wheel spins and spins) and iCal is not syncing properly with google calendar anymore. I'm not sure what happened in the past few weeks but it has gotten bad! My computer is only a couple months old. I ran etrecheck in hopes someone can tell me what's going on. I also ran disc utility and it found nothing wrong with my hard drive. I'm running 10.9.1, 2,7 GHz Intel Core i5, 8GB memory.
Thanks in advance!! If all else fails I will head to the nearest Genius Bar.
Here is the etrecheck report:
Hardware Information:
          iMac (21.5-inch, Late 2013)
          iMac - model: iMac14,1
          1 2.7 GHz Intel Core i5 CPU: 4 cores
          8 GB RAM
Video Information:
          Intel Iris Pro - VRAM: 1024 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 3:30:26
Disk Information:
          APPLE HDD HTS541010A9E662 disk0 : (1 TB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 999.35 GB (796.12 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. iPad
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. FaceTime HD Camera (Built-in)
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
          [System] com.adobe.fpsaud.plist 3rd-Party support link
          [System] com.leapfrog.connect.authdaemon.plist 3rd-Party support link
          [System] com.macpaw.CleanMyMac2.Agent.plist 3rd-Party support link
          [System] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [System] com.oracle.java.Helper-Tool.plist 3rd-Party support link
Launch Agents:
          [System] com.citrix.AuthManager_Mac.plist 3rd-Party support link
          [System] com.citrix.ReceiverHelper.plist 3rd-Party support link
          [System] com.citrix.ServiceRecords.plist 3rd-Party support link
          [System] com.oracle.java.Java-Updater.plist 3rd-Party support link
User Launch Agents:
          [not loaded] com.google.Chrome.framework.plist 3rd-Party support link
          [not loaded] com.google.keystone.agent.plist 3rd-Party support link
          [not loaded] com.leapfrog.connect.monitor.plist 3rd-Party support link
          [not loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist 3rd-Party support link
          [not loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist 3rd-Party support link
          [not loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist 3rd-Party support link
User Login Items:
          None
Internet Plug-ins:
          FlashPlayer-10.6: Version: 12.0.0.44 - SDK 10.6 3rd-Party support link
          QuickTime Plugin: Version: 7.7.3
          Flash Player: Version: 12.0.0.44 - SDK 10.6 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          SharePointBrowserPlugin: Version: 14.3.9 - SDK 10.6 3rd-Party support link
          CitrixICAClientPlugIn: Version: 11.8.2 - SDK 10.7 3rd-Party support link
          Silverlight: Version: 5.1.20913.0 - SDK 10.6 3rd-Party support link
          JavaAppletPlugin: Version: Java 7 Update 51 3rd-Party support link
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
User Internet Plug-ins:
          Google Earth Web Plug-in: Version: 7.1 3rd-Party support link
3rd Party Preference Panes:
          Flash Player 3rd-Party support link
          Java 3rd-Party support link
Bad Fonts:
          None
Old Applications:
          /Library/Application Support/Microsoft/MERP2.0
                    Microsoft Error Reporting:          Version: 2.2.9 - SDK 10.4 3rd-Party support link
                    Microsoft Ship Asserts:          Version: 1.1.4 - SDK 10.4 3rd-Party support link
          Solver:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Applications/Microsoft Office 2011/Office/Add-Ins/Solver.app
          SLLauncher:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Library/Application Support/Microsoft/Silverlight/OutOfBrowser/SLLauncher.app
          /Applications/Microsoft Office 2011/Office
                    Open XML for Excel:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Office Setup Assistant:          Version: 14.3.8 - SDK 10.5 3rd-Party support link
                    Microsoft Alerts Daemon:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    SyncServicesAgent:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Database Daemon:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Graph:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Database Utility:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Office Reminders:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Upload Center:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    My Day:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Chart Converter:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Clip Gallery:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
          /Applications/Microsoft Office 2011
                    Microsoft PowerPoint:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Excel:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Outlook:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Word:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Document Connection:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
          Microsoft Language Register:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    /Applications/Microsoft Office 2011/Additional Tools/Microsoft Language Register/Microsoft Language Register.app
          Microsoft AutoUpdate:          Version: 2.3.6 - SDK 10.4 3rd-Party support link
                    /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               5%          ReportCrash
               4%          CalendarAgent
               1%          WindowServer
               0%          EtreCheck
               0%          coresymbolicationd
Top Processes by Memory:
          890 MB          CalendarAgent
          49 MB          Google Chrome
          28 MB          com.apple.WebKit.WebContent
          25 MB          Safari
          25 MB          iTunes
Virtual Memory Information:
          17 MB          Free RAM
          1.22 GB          Active RAM
          1.21 GB          Inactive RAM
          1.03 GB          Wired RAM
          993 MB          Page-ins
          97 MB          Page-outs

1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve your problem.
2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
3. Below are instructions to run a UNIX shell script, a type of program. All it does is to gather information about the state of your computer. That information goes nowhere unless you choose to share it on this page. However, you should be cautious about running any kind of program (not just a shell script) at the request of a stranger on a public message board. If you have doubts, search this site for other discussions in which this procedure has been followed without any report of ill effects. If you can't satisfy yourself that the instructions are safe, don't follow them.
Here's a summary of what you need to do, if you choose to proceed: Copy a line of text from this web page into the window of another application. Wait for the script to run. It usually takes a couple of minutes. Then paste the results, which will have been copied automatically, back into a reply on this page. The sequence is: copy, paste, wait, paste again. Details follow.
4. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
5. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply.
6. The script is a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, though you may not see all of it in your browser, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.
Triple-click anywhere in the line of text below on this page to select it:
PATH=/usr/bin:/bin:/usr/sbin:/sbin; clear; Fb='%s\n\t(%s)\n'; Fm='\n%s:\n\n%s\n'; Fr='\nRAM details:\n%s\n'; Fs='\n%s: %s\n'; Fu='user %s%%, system %s%%'; PB="/usr/libexec/PlistBuddy -c Print"; A () { [[ a -eq 0 ]]; }; M () { find -L "$d" -type f | while read f; do file -b "$f" | egrep -q XML\|exec && echo $f; done; }; Pc () { o=`grep -v '^ *#' "$2"`; Pm "$1"; }; Pm () { [[ "$o" ]] && o=`sed '/^ *$/d; s/^ */   /' <<< "$o"` && printf "$Fm" "$1" "$o"; }; Pp () { o=`$PB "$2" | awk -F'= ' \/$3'/{print $2}'`; Pm "$1"; }; Ps () { o=`echo $o`; [[ ! "$o" =~ ^0?$ ]] && printf "$Fs" "$1" "$o"; }; R () { o=; [[ r -eq 0 ]]; }; SP () { system_profiler SP${1}DataType; }; id | grep -qw '80(admin)'; a=$?; A && sudo true; r=$?; t=`date +%s`; clear; { A || echo $'No admin access\n'; A && ! R && echo $'No root access\n'; SP Software | sed '8!d;s/^ *//'; o=`SP Hardware | awk '/Mem/{print $2}'`; o=$((o<4?o:0)); Ps "Total RAM (GB)"; o=`SP Memory | sed '1,5d; /[my].*:/d'`; [[ "$o" =~ s:\ [^O]|x([^08]||0[^2]8[^0]) ]] && printf "$Fr" "$o"; o=`SP Diagnostics | sed '5,6!d'`; [[ "$o" =~ Pass ]] || Pm "POST"; o=`SP USB | sed -n '1d; /:$/{s/ *:$//;x;s/\n//p;}; /V.*[(]/{s/^[^(]*/ /;H;}; /Apple/{s/.//g;h;}'`; Pm "USB"; o=`pmset -g therm | sed 's/^.*C/C/'`; [[ "$o" =~ No\ th|pms ]] && o=; Pm "Thermal conditions"; o=`pmset -g sysload | grep -v :`; [[ "$o" =~ =\ [^GO] ]] || o=; Pm "System load advisory"; o=`nvram boot-args | awk '{$1=""; print}'`; Ps "boot-args"; d=(/ ""); D=(System User); E=; for i in 0 1; do o=`cd ${d[$i]}L*/L*/Dia*; for f in *; do [[ "$f" =~ h$ ]] && grep -ql "^Thread c" "$f" && e=" *" || e=; awk -F_ '!/ag$/{$NF=a[split($NF,a,".")]; print $0 "'"$e"'"}' <<< "$f"; done | tail`; Pm "${D[$i]} diagnostics"; done; [[ "$o" =~ \*$ ]] && printf $'\n* Code injection\n'; o=`syslog -F bsd -k Sender kernel -k Message CReq 'GPU |hfs: Ru|I/O e|n Cause: -|NVDA\(|pagin|SATA W|ssert|timed? ?o' | tail -n25 | awk '/:/{$4=""; $5=""};1'`; Pm "Kernel messages"; o=`df -m / | awk 'NR==2 {print $4}'`; o=$((o<5120?o:0)); Ps "Free space (MiB)"; o=$(($(vm_stat | awk '/eo/{sub("\\.",""); print $2}')/256)); o=$((o>=1024?o:0)); Ps "Pageouts (MiB)"; s=( `sar -u 1 10 | sed '$!d'` ); [[ s[4] -lt 85 ]] && o=`printf "$Fu" ${s[1]} ${s[3]}` || o=; Ps "Total CPU usage" && { s=(`ps acrx -o comm,ruid,%cpu | sed '2!d'`); o=${s[2]}%; Ps "CPU usage by process \"$s\" with UID ${s[1]}"; }; s=(`top -R -l1 -n1 -o prt -stats command,uid,prt | sed '$!d'`); s[2]=${s[2]%[+-]}; o=$((s[2]>=25000?s[2]:0)); Ps "Mach ports used by process \"$s\" with UID ${s[1]}"; o=`kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1`; Pm "Loaded extrinsic kernel extensions"; R && o=`sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|calendarse|cups|dove|isc|ntp|post[fg]|x)/{print $3}'`; Pm "Extrinsic system jobs"; o=`launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'`; Pm "Extrinsic agents"; o=`for d in {/,}L*/Lau*; do M; done | grep -v com\.apple\.CSConfig | while read f; do ID=$($PB\ :Label "$f") || ID="No job label"; printf "$Fb" "$f" "$ID"; done`; Pm "launchd items"; o=`for d in /{S*/,}L*/Star*; do M; done`; Pm "Startup items"; o=`find -L /S*/L*/E* {/,}L*/{A*d,Compon,Ex,In,Keyb,Mail/B,P*P,Qu*T,Scripti,Servi,Spo}* -type d -name Contents -prune | while read d; do ID=$($PB\ :CFBundleIdentifier "$d/Info.plist") || ID="No bundle ID"; [[ "$ID" =~ ^com\.apple\.[^x]|Accusys|ArcMSR|ATTO|HDPro|HighPoint|driver\.stex|hp-fax|\.hpio|JMicron|microsoft\.MDI|print|SoftRAID ]] || printf "$Fb" "${d%/Contents}" "$ID"; done`; Pm "Extrinsic loadable bundles"; o=`find -L /u*/{,*/}lib -type f | while read f; do file -b "$f" | grep -qw shared && ! codesign -v "$f" && echo $f; done`; Pm "Unsigned shared libraries"; o=`for e in DYLD_INSERT_LIBRARIES DYLD_LIBRARY_PATH; do launchctl getenv $e; done`; Pm "Environment"; o=`find -L {,/u*/lo*}/e*/periodic -type f -mtime -10d`; Pm "Modified periodic scripts"; o=`scutil --proxy | grep Prox`; Pm "Proxies"; o=`scutil --dns | awk '/r\[0\] /{if ($NF !~ /^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./) print $NF; exit}'`; Ps "DNS"; R && o=`sudo profiles -P | grep : | wc -l`; Ps "Profiles"; f=auto_master; [[ `md5 -q /etc/$f` =~ ^b166 ]] || Pc $f /etc/$f; for f in fstab sysctl.conf crontab launchd.conf; do Pc $f /etc/$f; done; Pc "hosts" <(grep -v 'host *$' /etc/hosts); Pc "User launchd" ~/.launchd*; R && Pc "Root crontab" <(sudo crontab -l); Pc "User crontab" <(crontab -l); R && o=`sudo defaults read com.apple.loginwindow LoginHook`; Pm "Login hook"; Pp "Global login items" /L*/P*/loginw* Path; Pp "User login items" L*/P*/*loginit* Name; Pp "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed 's/\..*$//;s/-[1-9]$//'; o=`find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l`; Ps "Restricted user files"; cd; o=`SP Fonts | egrep "Valid: N|Duplicate: Y" | wc -l`; Ps "Font problems"; o=`find L*/{Con,Pref}* -type f ! -size 0 -name *.plist | while read f; do plutil -s "$f" >&- || echo $f; done`; Pm "Bad plists"; d=(Desktop L*/Keyc*); n=(20 7); for i in 0 1; do o=`find "${d[$i]}" -type f -maxdepth 1 | wc -l`; o=$((o<=n[$i]?0:o)); Ps "${d[$i]##*/} file count"; done; o=$((`date +%s`-t)); Ps "Elapsed time (s)"; } 2>/dev/null | pbcopy; exit 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
7. Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign ($) or a percent sign (%). If you get the percent sign, enter
exec sh
in the window and press return. You should then get a new line ending in a dollar sign.
Click anywhere in the Terminal window and paste (command-V). The text you pasted should vanish immediately. If it doesn't, press the return key.
If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important. If you don't know your password, or if you prefer not to enter it, just press return three times at the password prompt.
If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, there will be nothing in the Terminal window and no indication of progress. Wait for the line "[Process completed]" to appear. If you don't see it within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report your results. No harm will be done.
8. When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
When you post the results, you might see the message, "You have included content in your post that is not permitted." It means that the forum software has misidentified something in the post as a violation of the rules. If it happens, please post the test results on Pastebin, then post a link here to the page you created.
Note: This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
Copyright © 2014 Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Terms of Use of Apple Support Communities ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

IMac running very slow

Good Friday to you all.
I am struggling to figure out why my computer is running so painfully slow. All applications even safari. I have a word document open and safari running. I can hear the system running in the background all the time. Like it is working on something all the time.
Info from version is Snow leopard 10.6.8
Capacity: 250 GB, Available 72 GB.
That is all I know to look for. I have used clean my MAC to scan for excess files etc. but that is about all I know to look for.
Any tips would be helpful.
My next idea was to buy a external hard drive to off load some big files, like movies and pictures to give me more space.
But this should have anything to do with how slow safari is running ?
Thank you,
Karen
ALmonte , Ontario Canada

Since this problem started, have you restarted the iMac?
Mac OS X uses hidden files called swap files for its virtual memory scheme. If you are logged in for a long time (like a week or more), those files can get fragmented, making basic operations less efficient. So if things start to feel sluggish or you see odd behavior, the first thing you should do is restart.
This can also happen (or happen more quickly) if you are running low on free space on your startup volume. Once you get below about 15% free, the remaining free space will get more fragmented, and Mac OS X will not be able to operate as efficiently. So if you are running low on free space, get an external drive and copy off some of your data to free up space on your startup volume.
Another thing you should do periodically is run Disk Utility and use the +Repair Disk Permissions+ routine (on +First Aid+ tab) on your startup volume. I do it immediately before running Software Update to install an update.

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