MacBook Pro(Early 2011) extremely slow speed on Yosemite(10.10.2)

Question

Hi All,
I installed and then reinstalled a fresh Yosemite But now i am experiencing issues like very slow speed of the OS & fan continuously ON. Mavericks was working fine.
this is my ertecheck report
EtreCheck version: 2.1.8 (121)
Report generated 1 April 2015 12:03:11 am IST
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 Pro (13-inch, Early 2011) (Technical Specifications)
    MacBook Pro - model: MacBookPro8,1
    1 2.7 GHz Intel Core i7 CPU: 2-core
    10 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            8 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless:  en1: 802.11 a/b/g/n
    Battery Health: Replace Soon - Cycle count 1329
Video Information: ℹ️
    Intel HD Graphics 3000 - VRAM: 512 MB
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 4:1:57
Disk Information: ℹ️
    Hitachi HTS545050B9A302 disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        MacHDD_2 (disk0s4) /Volumes/MacHDD_2 : 349.63 GB (118.65 GB free)
        MacHDD_1 (disk1) / : 149.11 GB (104.40 GB free)
            Core Storage: disk0s2 149.48 GB Online
    MATSHITADVD-R   UJ-898
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Launch Daemons: ℹ️
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Google Chrome    Application Hidden (/Applications/Google Chrome.app)
Internet Plug-ins: ℹ️
    Default Browser: Version: 600 - SDK 10.10
    QuickTime Plugin: Version: 7.7.3
    SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
3rd Party Preference Panes: ℹ️
    None
Time Machine: ℹ️
    Mobile backups: OFF
    Auto backup: NO - Auto backup turned off
    Volumes being backed up:
        MacHDD_1: Disk size: 149.11 GB Disk used: 44.71 GB
    Destinations:
        MacHDD_2 [Local]
        Total size: 349.63 GB
        Total number of backups: 0
        Oldest backup: -
        Last backup: -
        Size of backup disk: Adequate
            Backup size 349.63 GB > (Disk used 44.71 GB X 3)
Top Processes by CPU: ℹ️
        26%    Microsoft Outlook
        12%    coreaudiod
         6%    Google Chrome
         3%    WindowServer
         1%    launchservicesd
Top Processes by Memory: ℹ️
    215 MB    mds_stores
    193 MB    Google Chrome
    183 MB    Google Chrome Helper
    129 MB    iTunes
    107 MB    Microsoft Outlook
Virtual Memory Information: ℹ️
    5.04 GB    Free RAM
    3.41 GB    Active RAM
    698 MB    Inactive RAM
    1.59 GB    Wired RAM
    4.71 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Mar 31, 2015, 07:59:25 PM    Self test - passed

Answer 1

Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilities 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.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities 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. Select Restart from the Apple menu.
4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, 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.
5. Reinstall Yosemite from Scratch:
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
How to Clean Install OS X Yosemite
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.