MBP Early '11 nearly unusuable after upgrade to OS X Yosemite

Question

I am having problems with my mac getting even close to the boot times it had before upgrading to OS X Yosemite. It also is having problems with disconnecting from the wifi and always has problems loading up programs, folders, and etc.
Below is the EtreCheck report:
Problem description:
Macbook Pro is loading very slow
EtreCheck version: 2.0.11 (98)
Report generated November 13, 2014 at 9:01:38 PM CST
Hardware Information: ℹ️
    MacBook Pro (13-inch, Early 2011) (Verified)
    MacBook Pro - model: MacBookPro8,1
    1 2.3 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
    Intel HD Graphics 3000 - VRAM: 384 MB
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.10 (14A389) - Uptime: 7 days 4:48:31
Disk Information: ℹ️
    Hitachi HTS545032B9A302 disk0 : (320.07 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]: 318.84 GB (274.83 GB free)
            Core Storage: disk0s2 319.21 GB Online
    OPTIARC DVD RW AD-5970H
USB Information: ℹ️
    Apple Computer, Inc. IR Receiver
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM2070 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
    [failed]    com.apple.rcd.plist
    [running]    com.paragon.NTFS.notify.plist Support
Problem System Launch Daemons: ℹ️
    [failed]    com.apple.AssetCacheLocatorService.plist
    [failed]    com.apple.ctkd.plist
    [failed]    com.apple.icloud.findmydeviced.plist
    [failed]    com.apple.periodic-weekly.plist
    [failed]    com.apple.wdhelper.plist
    [failed]    com.apple.xpc.smd.plist
Launch Agents: ℹ️
    [loaded]    com.examsoft.softest.plist Support
    [loaded]    com.paragon.updater.plist Support
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist Support
    [running]    com.examsoft.softest.service.plist Support
    [loaded]    com.microsoft.office.licensing.helper.plist Support
    [loaded]    com.paragon.ntfs11.refresh.plist Support
    [loaded]    jp.co.canon.MasterInstaller.plist Support
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist Support
    [loaded]    com.google.keystone.agent.plist Support
User Login Items: ℹ️
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    ApplicationHidden (/Applications/Dropbox.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 15.0.0.223 - 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: 15.0.0.223 - SDK 10.6 Support
    QuickTime Plugin: Version: 7.7.3
    SharePointBrowserPlugin: Version: 14.4.6 - SDK 10.6 Support
    Silverlight: Version: 5.1.30514.0 - SDK 10.6 Support
    MeetingJoinPlugin: Version: (null) - SDK 10.6 Support
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
Safari Extensions: ℹ️
    Adblock Plus
    Reddit Enhancement Suite
3rd Party Preference Panes: ℹ️
    Flash Player  Support
    Paragon NTFS for Mac ® OS X  Support
    Xmarks for Safari  Support
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
        18%    systemstats
        10%    firefox
        10%    Activity Monitor
         7%    WindowServer
         4%    CVMCompiler
Top Processes by Memory: ℹ️
    425 MB    firefox
    189 MB    Mail
    142 MB    plugin-container
    82 MB    Microsoft Word
    73 MB    com.apple.WebKit.WebContent
Virtual Memory Information: ℹ️
    21 MB    Free RAM
    1.02 GB    Active RAM
    1.02 GB    Inactive RAM
    1.17 GB    Wired RAM
    42.16 GB    Page-ins
    1.18 GB    Page-outs

Answer 1

You haven't enough memory for all the junk you are trying to run concurrently. I suggest you clean up the act. The following applies to Mavericks and Yosemite.
A. Install or Reinstall Lion/Mountain Lion 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.
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.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
B. Install Mavericks, Lion/Mountain Lion Using Internet Recovery
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.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.