Yosemite slow on Macbook Air

Help! Seriously....
I updated to Yosemite the other day and since then my Macbook is extremely slow...
It is really annoying, especially because I have no clue what the reason could be.
I would really appreciate if anyone has an idea how to fix this.
Apple doesn´t seem to know the answer! (What a let down...)
Thank you very much for taking your time!
Some of the problems:
+ The fan is running much more often now
+ MacBook gets very warm
+ Battery drain is extremely high
+ Animations and scrolling inside OS not fluent anymore
I have already tried the following:
+ new install
+ verify disk permissions
+ SMC-Reset
+ PRAM Reset (Cmd+P+R)
Here comes my report, I really hope anyone can help me with that.
I am really disappointed of Apple... What a let down!
Problem description:
yosemite slows down macbook air
EtreCheck version: 2.0.6 (91)
Report generated 20. Oktober 2014 16:22:47 MESZ
Hardware Information: ℹ️
MacBook Air (Verified)
MacBook Air - model: MacBookAir6,2
1 1.7 GHz Intel Core i7 CPU: 2-core
8 GB RAM Not upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Video Information: ℹ️
Intel HD Graphics 5000 -
Color LCD 1440 x 900
System Software: ℹ️
OS X 10.10 (14A389) - Uptime: 6:6:5
Disk Information: ℹ️
APPLE SSD SM0512F disk0 : (500,28 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / [Startup]: 499.05 GB (172.22 GB free)
Core Storage: disk0s2 499.42 GB Online
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Configuration files: ℹ️
/etc/sysctl.conf - Exists
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/Library/Extensions
[not loaded] foo.tap (1.0) Support
[not loaded] foo.tun (1.0) Support
/System/Library/Extensions
[loaded] com.Cycling74.driver.Soundflower (1.6.6 - SDK 10.6) Support
Startup Items: ℹ️
tap: Path: /Library/StartupItems/tap
tun: Path: /Library/StartupItems/tun
Startup items are obsolete and will not work in future versions of OS X
Launch Agents: ℹ️
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.adobe.AdobeCreativeCloud.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[running] com.edb.launchd.postgresql-8.4.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
[running] com.oracle.java.JavaUpdateHelper.plist Support
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist Support
[loaded] com.redgiantsoftware.updater.plist Support
[running] com.spotify.webhelper.plist Support
User Login Items: ℹ️
iTunesHelper ApplicationHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox ApplicationHidden (/Applications/Dropbox.app)
Porthole UNKNOWNHidden (missing value)
Internet Plug-ins: ℹ️
AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 Support
FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
Default Browser: Version: 600 - SDK 10.10
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
Flash Player: Version: 15.0.0.189 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
JavaAppletPlugin: Version: Java 7 Update 71 Check version
Safari Extensions: ℹ️
AdBlock
3rd Party Preference Panes: ℹ️
Flash Player Support
Growl Support
Java Support
Perian Support
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
     13% Folder Actions Dispatcher
      6% launchd
      5% launchservicesd
      5% coreservicesd
      4% WindowServer
Top Processes by Memory: ℹ️
1.33 GB Folder Actions Dispatcher
352 MB Safari
198 MB launchd
189 MB CalendarAgent
120 MB com.apple.WebKit.WebContent
Virtual Memory Information: ℹ️
127 MB Free RAM
3.36 GB Active RAM
3.19 GB Inactive RAM
997 MB Wired RAM
2.81 GB Page-ins
36 MB Page-outs

Had the same problem, finally realized that the FileVault Encryption was struck at 19%. Speed back up to normal after I disabled FileVault using terminal command - sudo fdesetup diable
To check whether the FileVault is the culprit, go to System Preferences --> Security & Privacy --> FileVault to see if encryption is in progress.. For me the blue bar was less than a quarter with status 'estimating time remaining'..
Then open Terminal and type in: sudo fdesetup disable
It will then ask for the admin password (to be it asked twice), then it was disabled... Back to normal life again..
Here is my terminal log for reference:
Last login: Tue Oct 21 23:05:13 on console
Gowthams-MBP:~ asgowtham$ fdesetup status
FileVault is On.
Encryption in progress: Percent completed = 18.80
Gowthams-MBP:~ asgowtham$ fdesetup status
FileVault is On.
Encryption in progress: Percent completed = 18.80
Gowthams-MBP:~ asgowtham$ fdesetup status
FileVault is On.
Encryption in progress: Percent completed = 18.80
Gowthams-MBP:~ asgowtham$ sudo fdesetup disable
Password:
Enter a password for '/':
..fdes.
FileVault has been disabled.
Gowthams-MBP:~ asgowtham$ fdesetup status
FileVault is Off.

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Hello, my computer has been almost unusable for the past few weeks, I'm quite sure since I installed Yosemite. I read on another thread that I should run EtreCheck and start my own discussion. Here are the results, please help
Problem description:
I installed Yosemite and now my computer is crawling, the fan goes on for long periods and gets overheated. My hard drive was full but I migrated many of my files to dropbox and made sure to only selective sync files that were necessary on a regular basis.
EtreCheck version: 2.1.8 (121)
Report generated 10 Mar 2015 16:01:21 CET
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Air (11-inch, Mid 2011) (Technical Specifications)
    MacBook Air - model: MacBookAir4,1
    1 1.6 GHz Intel Core i5 CPU: 2-core
    2 GB RAM Not upgradeable
        BANK 0/DIMM0
            1 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            1 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en0: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 295
Video Information: ℹ️
    Intel HD Graphics 3000 - VRAM: 288 MB
        Color LCD 1366 x 768
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 5 days 6:24:59
Disk Information: ℹ️
    APPLE SSD TS064C disk0 : (60,67 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
        Untitled (disk1) / : 59.46 GB (16.28 GB free)
            Encrypted AES-XTS Unlocked
            Core Storage: disk0s2 59.81 GB Online
USB Information: ℹ️
    Apple Inc. FaceTime Camera (Built-in)
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Problem System Launch Agents: ℹ️
    [killed]    com.apple.accountsd.plist
    [killed]    com.apple.AirPlayUIAgent.plist
    [killed]    com.apple.bird.plist
    [killed]    com.apple.CallHistoryPluginHelper.plist
    [killed]    com.apple.CallHistorySyncHelper.plist
    [killed]    com.apple.cloudd.plist
    [killed]    com.apple.cmfsyncagent.plist
    [killed]    com.apple.coreservices.appleid.authentication.plist
    [killed]    com.apple.coreservices.uiagent.plist
    [killed]    com.apple.EscrowSecurityAlert.plist
    [killed]    com.apple.icloud.fmfd.plist
    [killed]    com.apple.nsurlsessiond.plist
    [killed]    com.apple.pbs.plist
    [killed]    com.apple.printtool.agent.plist
    [killed]    com.apple.recentsd.plist
    [killed]    com.apple.sbd.plist
    [killed]    com.apple.scopedbookmarkagent.xpc.plist
    [killed]    com.apple.secd.plist
    [killed]    com.apple.security.cloudkeychainproxy.plist
    [killed]    com.apple.spindump_agent.plist
    [killed]    com.apple.syncdefaultsd.plist
    [killed]    com.apple.telephonyutilities.callservicesd.plist
    22 processes killed due to memory pressure
Problem System Launch Daemons: ℹ️
    [killed]    com.apple.awdd.plist
    [killed]    com.apple.cache_delete.plist
    [killed]    com.apple.coresymbolicationd.plist
    [killed]    com.apple.ctkd.plist
    [killed]    com.apple.diagnosticd.plist
    [killed]    com.apple.emond.aslmanager.plist
    [killed]    com.apple.icloud.findmydeviced.plist
    [killed]    com.apple.ifdreader.plist
    [killed]    com.apple.MobileFileIntegrity.plist
    [killed]    com.apple.nehelper.plist
    [killed]    com.apple.nsurlsessiond.plist
    [killed]    com.apple.periodic-daily.plist
    [killed]    com.apple.sandboxd.plist
    [killed]    com.apple.softwareupdate_download_service.plist
    [killed]    com.apple.softwareupdated.plist
    [killed]    com.apple.sysmond.plist
    [killed]    com.apple.systemstatsd.plist
    [killed]    com.apple.tccd.system.plist
    [killed]    com.apple.wdhelper.plist
    [killed]    com.apple.xpc.smd.plist
    [killed]    org.cups.cupsd.plist
    21 processes killed due to memory pressure
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.adobe.AdobeCreativeCloud.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_desktop.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_service.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [running]    com.spotify.webhelper.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application (/Applications/Dropbox.app)
Internet Plug-ins: ℹ️
    AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 [Click for support]
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
Safari Extensions: ℹ️
    Searchme [Adware! - Remove]
    Slick Savings [Adware! - Remove]
    Amazon Shopping Assistant [Adware! - Remove]
    Ebay Shopping Assistant [Adware! - Remove]
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
        51%    Dropbox
         6%    WindowServer
         1%    systemstatsd
         1%    Google Chrome
         0%    Finder
Top Processes by Memory: ℹ️
    79 MB    Dropbox
    77 MB    Google Chrome
    37 MB    Finder
    37 MB    iTunes
    32 MB    WindowServer
Virtual Memory Information: ℹ️
    39 MB    Free RAM
    466 MB    Active RAM
    445 MB    Inactive RAM
    911 MB    Wired RAM
    68.44 GB    Page-ins
    3.56 GB    Page-outs
Diagnostics Information: ℹ️
    Mar 9, 2015, 10:59:53 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/Adobe InDesign CC 2014_2015-03-09-105953_[redacted].crash

Safari Extensions: ℹ️
    Searchme [Adware! - Remove]
    Slick Savings [Adware! - Remove]
    Amazon Shopping Assistant [Adware! - Remove]
    Ebay Shopping Assistant [Adware! - Remove]
Click the Adware! - Remove for help in removing.

Yosemite made my MacBook Air Slow

And its even slower when I use a second screen. Here's my EtreCheck report:
EtreCheck version: 2.0.11 (98)
Report generated November 20, 2014 at 12:02:42 PM EST
Hardware Information: ℹ️
MacBook Air (Verified)
MacBook Air - model: MacBookAir6,2
1 1.7 GHz Intel Core i7 CPU: 2-core
8 GB RAM Not upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Video Information: ℹ️
Intel HD Graphics 5000 -
Color LCD 1440 x 900
2752H spdisplays_1080p
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: one day 23:25:59
Disk Information: ℹ️
APPLE SSD SM0256F disk0 : (251 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / [Startup]: 249.77 GB (143.86 GB free)
Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist Support
[invalid?] com.oracle.java.Java-Updater.plist Support
[running] com.trusteer.rapport.rapportd.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.google.keystone.daemon.plist Support
[loaded] com.macpaw.CleanMyMac2.Agent.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[invalid?] com.oracle.java.Helper-Tool.plist Support
[running] com.trusteer.rooks.rooksd.plist Support
[failed] dev.dnsmasq.plist Support
[running] dev.nginx.plist Support
User Launch Agents: ℹ️
[invalid?] com.citrixonline.GoToMeeting.G2MUpdate.plist Support
[loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist Support
[loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist Support
[loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist Support
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Google Drive Application (/Applications/Google Drive.app)
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 15.0.0.223 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 15.0.0.223 - SDK 10.6 Support
Default Browser: Version: 600 - SDK 10.10
o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
SharePointBrowserPlugin: Version: 14.4.3 - SDK 10.6 Support
googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
SlingPlayer: Version: (null) - SDK 10.8 Support
User Internet Plug-ins: ℹ️
CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 Support
3rd Party Preference Panes: ℹ️
Flash Player Support
Trusteer Endpoint Protection Support
Time Machine: ℹ️
Mobile backups: OFF
Auto backup: NO - Auto backup turned off
Volumes being backed up:
Destinations:
My Passport for Mac [Local]
Total size: 1.00 TB
Total number of backups: 0
Oldest backup: -
Last backup: -
Size of backup disk: Excellent
Backup size 1.00 TB > (Disk size 0 B X 3)
Top Processes by CPU: ℹ️
      13% WindowServer
      7% Airmail 2
      6% syncdefaultsd
      1% Google Chrome Canary
      1% com.apple.WebKit.Plugin.64
Top Processes by Memory: ℹ️
352 MB Airmail 2
198 MB Google Chrome Canary
163 MB softwareupdated
155 MB feedly
127 MB com.apple.WebKit.WebContent
Virtual Memory Information: ℹ️
29 MB Free RAM
3.30 GB Active RAM
3.28 GB Inactive RAM
1.18 GB Wired RAM
19.19 GB Page-ins
347 MB Page-outs

Thanks a brod and Lex! Ok I did the stuff you suggested. I also tried uninstalling Java via terminal and according to Oracle it should be uninstalled but I'm not sure. Seems to be running much better but it generally does at the beginning after a restart I think. Here's my updated EtreCheck log:
EtreCheck version: 2.0.11 (98)
Report generated November 20, 2014 at 2:22:15 PM EST
Hardware Information: ℹ️
MacBook Air (Verified)
MacBook Air - model: MacBookAir6,2
1 1.7 GHz Intel Core i7 CPU: 2-core
8 GB RAM Not upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Video Information: ℹ️
Intel HD Graphics 5000 -
Color LCD 1440 x 900
2752H spdisplays_1080p
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 0:49:39
Disk Information: ℹ️
APPLE SSD SM0256F disk0 : (251 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / [Startup]: 249.77 GB (146.97 GB free)
Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist Support
[invalid?] com.oracle.java.Java-Updater.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.google.keystone.daemon.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[invalid?] com.oracle.java.Helper-Tool.plist Support
[failed] dev.dnsmasq.plist Support
[running] dev.nginx.plist Support
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Google Drive Application (/Applications/Google Drive.app)
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 15.0.0.223 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 15.0.0.223 - SDK 10.6 Support
Default Browser: Version: 600 - SDK 10.10
o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
SharePointBrowserPlugin: Version: 14.4.3 - SDK 10.6 Support
googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
SlingPlayer: Version: (null) - SDK 10.8 Support
3rd Party Preference Panes: ℹ️
Flash Player Support
Time Machine: ℹ️
Mobile backups: OFF
Auto backup: NO - Auto backup turned off
Volumes being backed up:
Destinations:
My Passport for Mac [Local]
Total size: 1.00 TB
Total number of backups: 0
Oldest backup: -
Last backup: -
Size of backup disk: Excellent
Backup size 1.00 TB > (Disk size 0 B X 3)
Top Processes by CPU: ℹ️
      11% Airmail 2
      5% WindowServer
      4% Google Chrome
      1% fontd
      0% Dropbox
Top Processes by Memory: ℹ️
397 MB Airmail 2
180 MB Google Chrome
172 MB spindump
120 MB Google Drive
94 MB com.apple.WebKit.WebContent
Virtual Memory Information: ℹ️
957 MB Free RAM
3.88 GB Active RAM
2.84 GB Inactive RAM
907 MB Wired RAM
3.37 GB Page-ins
25 KB Page-outs

I am not able to download Yosemite onto my Macbook Air.

Please help me!
I've been trying to download Yosemite through the app store and by the time it finishes downloading the software and installing it, it said there is something wrong with the program. It said the file is couldn't recognize it and it is either tampered or corrupt. I have downloaded it multiple times and restarted the computer but it still gives the same response.
The specs of my Macbook Air:
2011 MacBook Air
Intel Core 2 Duo
RAM: 4 GB
Thank You.

On your iPhone, tap Settings > ITunes & App Store
Switch Music ON.
If that doesn't help, check restrictions. Settings > General > Restrictions

My macbook air became too slow, my macbook air became too slow

Hi dear Mac users
My macbook air became very slow.... is it because I have too many pics? or can I do some type of organization that I never did before?

Saying it is running slow is a bit vague, can you be more specific about when/how it is running slow (i.e. what tasks/programs/actions are you undertaking when it runs slow?)
It is doubtful that you have so many pics on your Air that it is running slow because of that, you'd have to have 10s of thousands of pictures to even come close to filling up the storage capacity of a 128 SSD (which I'm just guessing you have.)
By "organization" I'm assuming you're referring either to doing a disk defrag (not necessary on Mac's, especially an SSD driven Air due to the nature of SSD read/write capabilites,) or you're referring to how you have your pictures arranged in files on your storage drive, which isn't likely to be the culprit, either.
Given the lack of knowledge I'm going to guess that if you're noticing the slowness during normal operations it is probably going to be due to having too many CPU-intensive apps running at the same time (running flash based webpages is a major CPU hog as well as some high-res video or 3D apps/games.)
Let us know more and I'm sure someone here can help you figure it out, though.
Cheers!

Yosemite locks up MacBook Air then hangs on reboot

MacBook Air upgraded to Yosemite 10.10 (I think...can't login to confirm). Randomly freezes when it goes to sleep, won't allow login when I wake it up. I've tried resetting SMC, PRAM, holding SHIFT, pressing that... Nothing. I get nothing. I've read as many threads as there seem to be on the topics. Any other suggestions?
I'd also like to know if there is a simple way to get dual monitors from a MacBook Air, but nothing I've seen indicates it's possible.

Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see:
Reinstall OS X Without Erasing the Drive
OS X Yosemite- Reinstall OS X
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

Why does safari is very slow on MacBook Air?, why does safari is very slow on MacBook Air?, why does safari is very slow on MacBook Air?, why does safari is very slow on MacBook Air?, why does safari is very slow on MacBook Air?

Hello. I am using MacBook Air. Safari is very slow and it doesn't open many websites. for instance: dizi-mag.com . please help me

Please answer as many of the following questions as you can. You may already have answered some of them.
1. Have you restarted your router and broadband modem since you first noticed the problem? If the answer is no, do that now and see whether there's any change.
2. Are any other web browsers installed, and are they also slow?
3. What about other Internet applications, such as iTunes and the App Store?
4. Are there any other devices on the same network that can browse the Web, and are they also slow?
5. If you can test Safari on another network, is it slow there too?
6. If you connect to your router with Wi-Fi and you can also connect with Ethernet, do that and turn off Wi-Fi. Any difference?

Yosemite slow on Macbook Air

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