Mac slow and dazed

Question

My Mac has become suddenly slow; the spinning wheel spins endlessly; Chrome crashes very frequently; programs take a long time to open.
Kindly help.
I've pasted results from Entrecheck here:
Problem description:
My mac became very slow, Chrome crashes often, spinning wheel appears so often.
EtreCheck version: 2.1.8 (121)
Report generated 4 March 2015 1:05:52 am IST
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Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (13-inch, Late 2011) (Technical Specifications)
    MacBook Pro - model: MacBookPro8,1
    1 2.4 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
    Battery Health: Check Battery - Cycle count 490
Video Information: ℹ️
    Intel HD Graphics 3000 - VRAM: 384 MB
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 3:47:57
Disk Information: ℹ️
    ST9500325ASG disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        Mac (disk1) / : 498.88 GB (303.59 GB free)
            Core Storage: disk0s2 499.25 GB Online
    MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
    Apple Computer, Inc. IR Receiver
    PixArt USB Optical Mouse
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Configuration files: ℹ️
    /etc/hosts - Count: 65
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
        /Library/Extensions
    [not loaded]    org.virtualbox.kext.VBoxDrv (4.2.0) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxNetAdp (4.2.0) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxNetFlt (4.2.0) [Click for support]
    [not loaded]    org.virtualbox.kext.VBoxUSB (4.2.0) [Click for support]
        /System/Library/Extensions
    [not loaded]    au.com.glassechidna.heimdall_usb_shield (6.0) [Click for support]
    [not loaded]    com.ZTE.driver.ModemDriverMac (1.0.2d1) [Click for support]
    [not loaded]    com.devguru.driver.SamsungComposite (1.2.44 - SDK 10.6) [Click for support]
    [not loaded]    com.macvide.driver.MacVideAudioConnectorDriver (1.0.0) [Click for support]
        /System/Library/Extensions/ssuddrv.kext/Contents/PlugIns
    [not loaded]    com.devguru.driver.SamsungACMControl (1.2.44 - SDK 10.6) [Click for support]
    [not loaded]    com.devguru.driver.SamsungACMData (1.2.44 - SDK 10.6) [Click for support]
    [not loaded]    com.devguru.driver.SamsungMTP (1.2.44 - SDK 10.5) [Click for support]
    [not loaded]    com.devguru.driver.SamsungSerial (1.2.44 - SDK 10.6) [Click for support]
Startup Items: ℹ️
    HWNetMgr: Path: /Library/StartupItems/HWNetMgr
    HWPortDetect: Path: /Library/StartupItems/HWPortDetect
    VirtualBox: Path: /Library/StartupItems/VirtualBox
    Startup items are obsolete in OS X Yosemite
Problem System Launch Daemons: ℹ️
    [killed]    com.apple.ctkd.plist
    [killed]    com.apple.icloud.findmydeviced.plist
    [killed]    com.apple.ifdreader.plist
    [killed]    com.apple.nehelper.plist
    [killed]    com.apple.wdhelper.plist
    [killed]    org.cups.cupsd.plist
    6 processes killed due to memory pressure
Launch Agents: ℹ️
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.CS5ServiceManager.plist [Click for support]
    [running]    com.google.keystone.agent.plist [Click for support]
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_desktop.plist [Click for support]
    [running]    net.culater.SIMBL.Agent.plist [Click for support]
    [failed]    org.chromium.chromoting.plist [Click for support]
    [not loaded]    org.freedesktop.dbus-session.plist [Click for support]
    [loaded]    org.macosforge.xquartz.startx.plist [Click for support]
Launch Daemons: ℹ️
    [failed]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.adobe.SwitchBoard.plist [Click for support]
    [loaded]    com.anchorfree.ajaxserver.plist [Click for support]
    [failed]    com.backblaze.bzserv.plist [Click for support]
    [loaded]    com.barebones.authd.plist [Click for support]
    [failed]    com.geeNian.ShellExt.Daemon.plist [Click for support]
    [loaded]    com.github.GitHub.GHInstallCLI.plist [Click for support]
    [running]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.macromates.auth_server.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
    [loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
    [loaded]    com.teamviewer.Helper.plist [Click for support]
    [not loaded]    com.teamviewer.teamviewer_service.plist [Click for support]
    [loaded]    net.sourceforge.MonolingualHelper.plist [Click for support]
    [not loaded]    org.freedesktop.dbus-system.plist [Click for support]
    [loaded]    org.macosforge.xquartz.privileged_startx.plist [Click for support]
User Login Items: ℹ️
    None
Internet Plug-ins: ℹ️
    nplastpass: Version: 2.0.11 [Click for support]
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    net.juniper.DSSafariExtensions: Version: Unknown [Click for support]
    AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 [Click for support]
    FlashPlayer-10.6: Version: 11.6.602.180 [Click for support]
    AdobePDFViewerNPAPI: Version: 11.0.0 - SDK 10.6 [Click for support]
    Flash Player: Version: 11.6.602.180 Outdated! Update
    QuickTime Plugin: Version: 7.7.3
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    SharePointBrowserPlugin: Version: 14.4.1 - SDK 10.6 [Click for support]
    AdobePDFViewer: Version: 11.0.0 - SDK 10.6 [Click for support]
    CouponPrinter-FireFox_v2: Version: 1.1.10 - SDK 10.6 [Click for support]
    EPPEX Plugin: Version: 3.0.5.0 [Click for support]
    JavaAppletPlugin: Version: Java 8 Update 31 Check version
3rd Party Preference Panes: ℹ️
    Backblaze Backup  [Click for support]
    remoting_host_prefpane  [Click for support]
    Flash Player  [Click for support]
    Java  [Click for support]
    Paragon NTFS for Mac ® OS X  [Click for support]
    PTHPasteboard  [Click for support]
    TeXDistPrefPane  [Click for support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
         7%    pkgutil
         5%    WindowServer
         4%    mds_stores
         1%    launchd
         1%    ps
Top Processes by Memory: ℹ️
    137 MB    pkgutil
    75 MB    mds_stores
    58 MB    com.apple.WebKit.WebContent
    47 MB    sort
    34 MB    Safari
Virtual Memory Information: ℹ️
    4 MB    Free RAM
    294 MB    Active RAM
    292 MB    Inactive RAM
    1.36 GB    Wired RAM
    18.37 GB    Page-ins
    627 MB    Page-outs
Diagnostics Information: ℹ️
    Mar 3, 2015, 09:02:45 PM    Self test - passed
    Standard users cannot read /Library/Logs/DiagnosticReports.
    Run as an administrator account to see more information.

Answer 1

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.  
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console 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 and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.