Q: Can anyone help me diagnose a slow iMac?

Can anyone help me diagnose a slow iMac?  Relatively new.  Purchased in mid-2011. 

Hardware Information:

    iMac (21.5-inch, Mid 2011)

    iMac - model: iMac12,1

    1 2.5 GHz Intel Core i5 CPU: 4 cores

    4 GB RAM

Video Information:

    AMD Radeon HD 6750M - VRAM: 512 MB

System Software:

    Mac OS X 10.6.8 (10K549) - Uptime: 3 days 7:38:6

Disk Information:

    ST3500418AS disk0 : (465.76 GB)

        (null) (disk0s1) <not mounted>: 200 MB

        Macintosh HD (disk0s2) /: 465.44 GB (436.89 GB free)

    HL-DT-STDVDRW  GA32N 

USB Information:

    Apple Inc. FaceTime HD Camera (Built-in)

    Western Digital My Passport 0730 465.73 GB

        My Passport (disk2s1) /Volumes/My Passport: 465.73 GB (434.64 GB free)

    Apple Inc. BRCM2046 Hub

        Apple Inc. Bluetooth USB Host Controller

    G-TECH G-RAID mini3 931.52 GB

        (null) (disk1s1) <not mounted>: 200 MB

        G-RAID mini (disk1s2) /Volumes/G-RAID mini: 931.2 GB (737.12 GB free)

    Apple Internal Memory Card Reader

    Apple Computer, Inc. IR Receiver

FireWire Information:

Thunderbolt Information:

    Apple, Inc. iMac

Kernel Extensions:

Problem System Launch Daemons:

    [not loaded]    org.samba.winbindd.plist

Problem System Launch Agents:

    [failed]    com.apple.Kerberos.renew.plist

Launch Daemons:

    [loaded]    com.adobe.fpsaud.plist

    [loaded]    com.trusteer.rooks.rooksd.plist

Launch Agents:

    [not loaded]    com.adobe.AAM.Updater-1.0.plist

    [loaded]    com.trusteer.rapport.rapportd.plist

User Launch Agents:

    [loaded]    com.adobe.AAM.Updater-1.0.plist

    [loaded]    com.adobe.ARM.202f4087f2bbde52e3ac2df389f53a4f123223c9cc56a8fd83a6f7ae.plist

    [loaded]    com.facebook.videochat.kathrynmayer.plist

    [loaded]    com.google.keystone.agent.plist

    [loaded]    com.macpaw.CleanMyMac.helperTool.plist

    [loaded]    com.macpaw.CleanMyMac.trashSizeWatcher.plist

    [loaded]    com.macpaw.CleanMyMac.volumeWatcher.plist

    [not loaded]    jp.co.canon.Inkjet_Extended_Survey_Agent.plist

User Login Items:

    Canon IJ Network Scanner Selector EX

    iTunesHelper

3rd Party Preference Panes:

    Flash Player

    Flip4Mac WMV

    Rapport

Internet Plug-ins:

    Easy-WebPrint EX.plugin

    EPPEX Plugin.plugin

    Flash Player.plugin

    FlashPlayer-10.6.plugin

    Flip4Mac WMV Plugin.plugin

    Google Earth Web Plug-in.plugin

    iPhotoPhotocast.plugin

    JavaAppletPlugin.plugin

    NPMPDRM.plugin

    QuickTime Plugin.plugin

    Silverlight.plugin

User Internet Plug-ins:

Bad Fonts:

    None

Top Processes by CPU:

         4%    EtreCheck

         3%    syslogd

         2%    firefox

         1%    WindowServer

         0%    coreservicesd

         0%    fontd

         0%    System Events

         0%    ODSAgent

Top Processes by Memory:

    274 MB       firefox

    111 MB       Finder

    78 MB        WindowServer

    70 MB        mds

    49 MB        coreservicesd

    45 MB        rapportd

    33 MB        Dock

    20 MB        SystemUIServer

    16 MB        EtreCheck

    12 MB        loginwindow

Virtual Memory Statistics

    1.55 GB      Free RAM

    765 MB       Active RAM

    973 MB       Inactive RAM

    767 MB       Wired RAM

    904 MB       Page-ins

    724 KB       Page-outs