Slow iMac (Diagnostic Report Attached)

Question

Hi all,
I wondered if someone could please decipher my diagnostic report to see if there are any pointers on fixing my recently slowed down Mac?  I see the words 'crashed' and 'excessive' appearing quite a lot and my spidey-senses tell me that this is not a good thing!
All help greatly appreciated.
Model Identifier: iMac12,2
System Version: OS X 10.9.3 (13D65)
Kernel Version: Darwin 13.2.0
Boot Mode: Normal
Time since boot: 2:18
Diagnostic reports
   2014-04-24 com.google.Chrome crash
   2014-05-13 com.google.Chrome crash
   2014-05-17 Preview crash
Log
   May 18 22:38:07 process com.apple.WebKit[2270] caught causing excessive wakeups. Observed wakeups rate (per sec): 181; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 45023
   May 18 22:46:19 process com.apple.WebKit[2319] thread 261466 caught burning CPU! It used more than 50% CPU (Actual recent usage: 89%) over 180 seconds. thread lifetime cpu usage 90.200414 seconds, (90.034150 user, 0.166264 system) ledger info: balance: 90006105222 credit: 90006105222 debit: 0 limit: 90000000000 (50%) period: 180000000000 time since last refill (ns): 101043075711
   May 19 18:27:47 process PluginProcess[932] caught causing excessive wakeups. Observed wakeups rate (per sec): 417; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 75743
   May 19 23:27:40 process com.apple.WebKit[1292] caught causing excessive wakeups. Observed wakeups rate (per sec): 205; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 109295
   May 20 11:35:46 process PluginProcess[1720] caught causing excessive wakeups. Observed wakeups rate (per sec): 221; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 45004
   May 21 08:39:11 process com.apple.WebKit[4969] caught causing excessive wakeups. EXC_RESOURCE supressed due to audio playback
   May 21 12:31:38 process PluginProcess[5160] caught causing excessive wakeups. Observed wakeups rate (per sec): 207; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 58080
   May 21 13:41:36 process PluginProcess[5300] caught causing excessive wakeups. Observed wakeups rate (per sec): 214; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 60805
   May 21 15:52:02 process PluginProcess[5503] caught causing excessive wakeups. Observed wakeups rate (per sec): 323; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 233684
   May 21 17:39:18 process PluginProcess[5689] caught causing excessive wakeups. Observed wakeups rate (per sec): 165; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 45005
   May 23 11:27:48 process PluginProcess[6879] caught causing excessive wakeups. Observed wakeups rate (per sec): 172; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 81972
   May 23 11:35:52 process com.apple.WebKit[6886] caught causing excessive wakeups. Observed wakeups rate (per sec): 162; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 89895
   May 23 12:53:14 process PluginProcess[6979] caught causing excessive wakeups. Observed wakeups rate (per sec): 165; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 52665
   May 23 15:55:54 process PluginProcess[7117] caught causing excessive wakeups. Observed wakeups rate (per sec): 303; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 865723
   May 23 17:38:25 process airportd[63] caught causing excessive wakeups. Observed wakeups rate (per sec): 22464; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 52328
   May 23 17:42:28 process com.apple.WebKit[383] thread 30463 caught burning CPU! It used more than 50% CPU (Actual recent usage: 94%) over 180 seconds. thread lifetime cpu usage 90.261360 seconds, (90.130689 user, 0.130671 system) ledger info: balance: 90007539172 credit: 90007539172 debit: 0 limit: 90000000000 (50%) period: 180000000000 time since last refill (ns): 94852995866
   May 23 18:31:46 process PluginProcess[472] caught causing excessive wakeups. Observed wakeups rate (per sec): 185; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 45074
   May 23 20:46:18 process com.apple.WebKit[626] caught causing excessive wakeups. Observed wakeups rate (per sec): 217; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 73970
   May 23 20:47:01 process WindowServer[112] caught causing excessive wakeups. Observed wakeups rate (per sec): 188; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 276460
   May 24 10:34:19 process com.apple.WebKit[1210] caught causing excessive wakeups. Observed wakeups rate (per sec): 157; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 69920
   May 24 11:01:01 Process Setup Assistant [229] disabling system-wide I/O Throttling
   May 24 11:01:01 Process Setup Assistant [229] disabling system-wide CPU Throttling
Daemons
   org.macosforge.xquartz.privileged_startx
   com.adobe.fpsaud
Agents
   com.apple.PTPCamera.45264.UUID
   org.macosforge.xquartz.startx
   com.epson.ews.launcher
   com.epson.esua.launcher
   com.plexapp.helper
   com.google.keystone.user.agent
   com.adobe.ARM.UUID
launchd
   /Library/LaunchAgents/com.epson.esua.launcher.plist
             (com.epson.esua.launcher)
   /Library/LaunchAgents/com.epson.ews.launcher.plist
             (com.epson.ews.launcher)
   /Library/LaunchAgents/org.macosforge.xquartz.startx.plist
             (org.macosforge.xquartz.startx)
   /Library/LaunchDaemons/com.adobe.fpsaud.plist
             (com.adobe.fpsaud)
   /Library/LaunchDaemons/org.macosforge.xquartz.privileged_startx.plist
             (org.macosforge.xquartz.privileged_startx)
   Library/LaunchAgents/com.adobe.ARM.UUID.plist
             (com.adobe.ARM.UUID)
   Library/LaunchAgents/com.google.keystone.agent.plist
             (com.google.keystone.user.agent)
   Library/LaunchAgents/com.plexapp.helper.plist
             (com.plexapp.helper)
Startup items
   /Library/StartupItems/HP IO/HP IO
   /Library/StartupItems/HP IO/Resources/version.plist
   /Library/StartupItems/HP IO/StartupParameters.plist
   /Library/StartupItems/HP Trap Monitor/HP Trap Monitor
   /Library/StartupItems/HP Trap Monitor/StartupParameters.plist
   /Library/StartupItems/HWNetMgr/HWNetCfg
   /Library/StartupItems/HWNetMgr/HWNetMgr
   /Library/StartupItems/HWNetMgr/StartupParameters.plist
Bundles
   /System/Library/Extensions/HuaweiDataCardDriver.kext
             (com.Huawei.driver.HuaweiDataCardDriver)
   /System/Library/Extensions/USBExpressCardCantWake_Huawei.kext
             (com.apple.dts.driver.USBExpressCardCantWake)
   /System/Library/Extensions/ZTEUSBCDCACMControl.kext
             (com.ZTE.driver.ZTEUSBCDCACMControl)
   /System/Library/Extensions/ZTEUSBCDCACMData.kext
             (com.ZTE.driver.ZTEUSBCDCACMData)
   /Library/Address Book Plug-Ins/SkypeABDialer.bundle
             (com.skype.skypeabdialer)
   /Library/Address Book Plug-Ins/SkypeABSMS.bundle
             (com.skype.skypeabsms)
   /Library/Audio/Plug-Ins/Components/A52Codec.component
             (com.shepmater.A52Codec)
   /Library/Audio/Plug-Ins/Components/Flip4Mac WMA Import.component
             (net.telestream.wmv.import)
   /Library/Internet Plug-Ins/AdobePDFViewer.plugin
             (com.adobe.acrobat.pdfviewer)
   /Library/Internet Plug-Ins/DirectorShockwave.plugin
             (com.adobe.director.shockwave.pluginshim)
   /Library/Internet Plug-Ins/Silverlight.plugin
             (com.microsoft.SilverlightPlugin)
   /Library/PreferencePanes/DivX.prefPane
             (com.divx.divxprefs)
   /Library/PreferencePanes/Flash Player.prefPane
             (com.adobe.flashplayerpreferences)
   /Library/PreferencePanes/Flip4Mac WMV.prefPane
             (net.telestream.wmv.prefpane)
   /Library/PreferencePanes/Perian.prefPane
             (org.perian.PerianPane)
   /Library/QuickTime/AC3MovieImport.component
             (com.cod3r.ac3movieimport)
   /Library/QuickTime/DivX Decoder.component
             (com.DivXInc.DivXDecoder)
   /Library/QuickTime/DivX Decoder.component/Contents/Resources
             (com.DivXInc.DivXDecoder)
   /Library/QuickTime/DivX Encoder.component
             (com.DivXInc.DivXCodec)
   /Library/QuickTime/FLACImport.component
             (Cannot parse a NULL or zero-length data)
   /Library/QuickTime/Flip4Mac WMV Advanced.component
             (N/A)
   /Library/QuickTime/Flip4Mac WMV Export.component
             (net.telestream.wmv.advanced)
   /Library/QuickTime/Flip4Mac WMV Import.component
             (net.telestream.wmv.export)
   /Library/QuickTime/Perian.component
             (net.telestream.wmv.import)
   /Library/QuickTime/XiphQT.component
             (org.perian.Perian)
   /Library/Spotlight/Microsoft Entourage.mdimporter
             (org.xiph.xiph-qt.xiphqt)
   Library/Internet Plug-Ins/Google Earth Web Plug-in.plugin
             (com.microsoft.entourageMDImporter)
             (com.Google.GoogleEarthPlugin.plugin)
Login hook
   /usr/bin/loginfix.sh
Font issues: 40
Bad plists
   /Library/Preferences/com.epson.EPSON Software Updater.UnInstallList.plist
   /Library/Preferences/com.epson.EpsonNet Config v4.UnInstallList.plist
Restricted files: 384
High file counts
   Desktop: 106
Elapsed time (s): 261

Answer 1

That's the hack mentioned in this thread:
ANNOYING FEATURE: Reopen Windows When Logging Back In
Since it's pointless, I suggest you back up all data, then remove it as directed at the bottom of that page. Then see below.
A.
Some of your user files (not system files) have incorrect permissions or are locked. This procedure will unlock all your user files, reset their ownership, and remove their access-control lists. If you've set special values for those attributes, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it, but you do need to follow the instructions below.
Back up all data.
Step 1
If you have more than one user, and the one in question is not an administrator, then go to Step 2.
Enter the following command in the Terminal window in the same way as before (triple-click, copy, and paste):
{ sudo chflags -R nouchg,nouappnd ~ $TMPDIR..; sudo chown -R $UID:staff ~ $_; sudo chmod -R u+rwX ~ $_; chmod -R -N ~ $_; } 2>&-
This time you'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning to be careful. If you don’t have a login password, you’ll need to set one before you can run the command. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The command may take several minutes to run, depending on how many files you have. Wait for a new line ending in a dollar sign ($) to appear, then quit Terminal.
Step 2 (optional)
Take this step only if you have trouble with Step 1, if you prefer not to take it, or if it doesn't solve the problem.
Start up in Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. A Terminal window will open. In that window, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window will open. You’re not  going to reset a password.
Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button.
Select
 ▹ Restart
from the menu bar.
B.
Launch the Font Book application and validate all fonts. You must select the fonts in order to validate them. See the built-in help and this support article for instructions. If Font Book finds any issues, resolve them.
From the application's menu bar, select
File ▹ Restore Standard Fonts...
You'll be prompted to confirm, and then to enter your administrator login password.
Start up in safe mode to rebuild the font caches. Restart as usual and test.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t start in safe mode. In that case, ask for instructions.
Also note that if you deactivate or remove any built-in fonts, for instance by using a third-party font manager, the system may become unstable.
C.
The Finder may be bogged down by too many items on the Desktop. Move the items to another folder.