Help! My Macbook is running slow and glitchy lately

Question

My macbook has been burning through my battery when I am running only one or two programs and even when the lid is closed and it is supposed to be on stand by.  My programs have been glitchy lately also.  Sometimes they run okay and at other times they are extremely slow and resource heavy though I don't know why.  I know that my macbook is older but thus far it has been a great computer and I would really like to squeeze a couple more years out of it.  Can you please give me some advice to help my computer run better with Yosemite?  I have included my computer stats and a EtreCheck for those who know what to look for on my computer.  Thanks for the help in advance.
Hardware Information: ℹ️
    MacBook (13-inch, Aluminum, Late 2008) (Technical Specifications)
    MacBook - model: MacBook5,1
    1 2.4 GHz Intel Core 2 Duo CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1067 MHz ok
        BANK 0/DIMM1
            2 GB DDR3 1067 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless:  en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 149
Video Information: ℹ️
    NVIDIA GeForce 9400M - VRAM: 256 MB
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.10.1 (14B25) - Time since boot: 4:59:10
Disk Information: ℹ️
    ST9500420AS disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Apple HD (disk0s2) / : 499.25 GB (178.35 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
    MATSHITADVD-R   UJ-868 
USB Information: ℹ️
    Apple Inc. Built-in iSight
    Apple, Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Applications/PMHMac.app
    [not loaded]    com.sony.driver.dsccamFirmwareUpdaterType00 (1 - SDK 10.5) [Click for support]
        /Library/Application Support/Avast/components/fileshield/unsigned
    [loaded]    com.avast.AvastFileShield (2.1.0 - SDK 10.9) [Click for support]
        /Library/Application Support/Avast/components/proxy/unsigned
    [loaded]    com.avast.PacketForwarder (2.0 - SDK 10.9) [Click for support]
        /Library/Extensions
    [not loaded]    com.sony.driver.dsccamDeviceInfo00 (1 - SDK 10.7) [Click for support]
        /System/Library/Extensions
    [not loaded]    com.Fender.iokit.FenderBroncoDriver (1.0.0) [Click for support]
    [not loaded]    com.Fender.iokit.FenderDriver (1.0.0) [Click for support]
    [loaded]    com.digidesign.iokit.DigiDal (8.0.3f1) [Click for support]
    [not loaded]    com.digidesign.iokit.DigiIO (8.0.3f1) [Click for support]
    [not loaded]    com.maudio.usb.producer.driver (1.8) [Click for support]
    [not loaded]    com.paceap.kext.pacesupport.master (5.7.2) [Click for support]
    [not loaded]    com.parallels.kext.prl_hid_hook (4.0 3522.205912) [Click for support]
    [not loaded]    com.parallels.kext.prl_hypervisor (4.0 3522.205912) [Click for support]
    [not loaded]    com.parallels.kext.prl_netbridge (4.0 3522.205912) [Click for support]
    [not loaded]    com.parallels.kext.prl_usb_connect (4.0 3522.205912) [Click for support]
    [not loaded]    com.parallels.kext.prl_vnic (4.0 3522.205912) [Click for support]
    [not loaded]    com.seagate.driver.PowSecDriverCore (5.2.6 - SDK 10.4) [Click for support]
    [not loaded]    com.xxxchurch.x3nke (1.0.0) [Click for support]
        /System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
    [not loaded]    com.paceap.kext.pacesupport.leopard (5.7.2) [Click for support]
    [not loaded]    com.paceap.kext.pacesupport.panther (5.7.2) [Click for support]
    [loaded]    com.paceap.kext.pacesupport.snowleopard (5.7.2) [Click for support]
    [not loaded]    com.paceap.kext.pacesupport.tiger (5.7.2) [Click for support]
        /System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
    [not loaded]    com.seagate.driver.PowSecLeafDriver_10_4 (5.2.6 - SDK 10.4) [Click for support]
    [not loaded]    com.seagate.driver.PowSecLeafDriver_10_5 (5.2.6 - SDK 10.5) [Click for support]
    [not loaded]    com.seagate.driver.SeagateDriveIcons (5.2.6 - SDK 10.4) [Click for support]
Startup Items: ℹ️
    DigidesignLoader: Path: /Library/StartupItems/DigidesignLoader
    M-Audio Producer USB: Path: /Library/StartupItems/M-Audio Producer USB
    PACESupport: Path: /Library/StartupItems/PACESupport
    ParallelsDesktopTransporter: Path: /Library/StartupItems/ParallelsDesktopTransporter
    Startup items are obsolete in OS X Yosemite
Problem System Launch Daemons: ℹ️
    [running]    com.seagate.TBDecorator.plist [Click for support]
Launch Agents: ℹ️
    [loaded]    com.avast.userinit.plist [Click for support]
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [loaded]    com.oracle.java.Java-Updater.plist [Click for support]
    [failed]    com.rosettastone.rosettastonedaemon.plist [Click for support]
    [running]    com.sony.PMBPortable.AutoRun.plist [Click for support]
    [running]    com.sony.SonyAutoLauncher.agent.plist [Click for support]
    [failed]    SBA_ListenerAgent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.avast.init.plist [Click for support]
    [loaded]    com.avast.uninstall.plist [Click for support]
    [failed]    com.avast.update.plist [Click for support]
    [loaded]    com.barebones.textwrangler.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Click for support]
    [failed]    com.vmware.launchd.vmware.plist [Click for support]
    [loaded]    com.x3.x3daemon.plist [Click for support]
    [loaded]    PACESupport.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [failed]    com.avast.home.userinit.plist [Click for support]
    [failed]    com.seagate.dashboard.plist [Click for support]
    [failed]    com.spotify.webhelper.plist [Click for support]
    [not loaded]    org.virtualbox.vboxwebsrv.plist [Click for support]
User Login Items: ℹ️
    SpeechSynthesisServer    Application  (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks /SpeechSynthesis.framework/Versions/A/SpeechSynthesisServer.app)
    HPEventHandler    UNKNOWN  (missing value)
Internet Plug-ins: ℹ️
    Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    GameTreeDM: Version: 1.4 [Click for support]
    AdobePDFViewer: Version: 9.5.5 [Click for support]
    Unity Web Player: Version: UnityPlayer version 2.6.1f3 [Click for support]
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    Scorch: Version: 6.1.0 [Click for support]
    iPhotoPhotocast: Version: 7.0
    RealPlayer Plugin: Version: Unknown [Click for support]
    DirectorShockwave: Version: 11.5.0r595 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Musicnotes: Version: 1.18.9 [Click for support]
    OVSHelper: Version: 1.0 [Click for support]
    DivXBrowserPlugin: Version: 2.1 [Click for support]
    Silverlight: Version: 4.0.60831.0 [Click for support]
    Google Earth Web Plug-in: Version: 5.2 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    Flip4Mac WMV Plugin: Version: 3.0.0.126   - SDK 10.8 [Click for support]
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    JavaAppletPlugin: Version: Java 7 Update 45 Check version
    OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]
User internet Plug-ins: ℹ️
    BrowserPlus_2.9.8: Version: 2.9.8 [Click for support]
    fbplugin_1_0_3: Version: Unknown [Click for support]
    WebEx64: Version: 1.0 - SDK 10.5 [Click for support]
Safari Extensions: ℹ️
    Facebook Ads Blocker
    Zotero Connector
    Evernote Web Clipper
    avast! Online Security
    Mindful Browsing
    DivX HiQ
    Cuss Off
    Dictionary
    Franker
    DivX Plus Web Player HTML5 <video>
    WebWatch
    Save to Pocket
User iTunes Plug-ins: ℹ️
    Flash Player: Version: 9.0.159.0 [Click for support]
3rd Party Preference Panes: ℹ️
    BrowserPlus  [Click for support]
    DivX  [Click for support]
    Flash Player  [Click for support]
    Flip4Mac WMV  [Click for support]
    Growl  [Click for support]
    HP Scanners  [Click for support]
    Java  [Click for support]
    M-Audio Producer USB  [Click for support]
    MacFUSE  [Click for support]
    Seagate Dashboard for Mac OSX  [Click for support]
    X3Watch  [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: ON
    Auto backup: YES
    Volumes being backed up:
        Apple HD: Disk size: 499.25 GB Disk used: 320.90 GB
    Destinations:
        Seagate Backup Plus Drive [Local]
        Total size: 999.86 GB
        Total number of backups: 7
        Oldest backup: 2014-06-24 03:40:37 +0000
        Last backup: 2015-02-07 04:53:29 +0000
        Size of backup disk: Adequate
            Backup size 999.86 GB > (Disk used 320.90 GB X 3)
Top Processes by CPU: ℹ️
         9%    kextd
         5%    systemstats
         2%    Safari
         1%    WindowServer
         0%    AppleSpell
Top Processes by Memory: ℹ️
    545 MB    com.apple.WebKit.WebContent
    120 MB    Safari
    64 MB    mds_stores
    64 MB    com.avast.daemon
    52 MB    Finder
Virtual Memory Information: ℹ️
    40 MB    Free RAM
    1.26 GB    Active RAM
    1.27 GB    Inactive RAM
    585 MB    Wired RAM
    155.02 GB    Page-ins
    647 MB    Page-outs
Diagnostics Information: ℹ️
    Feb 6, 2015, 07:20:08 PM    /Library/Logs/DiagnosticReports/Seagate Dashboard_2015-02-06-192008_[redacted].cpu_resource.diag [Click for details]
    Feb 6, 2015, 07:11:48 PM    Self test - passed

Answer 1

When you have the problem, 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.