Sluggish iMac 2008

I have a iMac 2008, 3.06 GHZ, Core 2 Duo, running 10.7 with 6 GB of RAM and a 500 GB HDD.
I have experience slowness when running Lion so I created a bootable external HDD and switch to the external HDD as my startup disk.  I have experience in doing this, that the system runs faster on start up, programs load faster and webpages load faster when using my external HDD as the start up disk.
Could my iMac be having some HDD problems in that's why it runs slow?
Is the processor too slow on the iMac?
Any thoughts would be appreciated?

Well I have a 2GHz 2GB, RAM, 120GB HD  MacBook Pro and it's fast enough for me.
Have you used Activity Monitor to review what is running?
Regards,
Shawn

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        WDC WD5000AAKS-40YGA1 disk0 : (500.11 GB)
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            Macintosh HD (disk0s2) /  [Startup]: 499.25 GB (100.68 GB free)
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
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        ASMedia AS2105 2 TB
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        [loaded]    com.oracle.java.Java-Updater.plist Support
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        [loaded]    com.adobe.fpsaud.plist Support
        [loaded]    com.leapfrog.connect.shell.plist Support
        [loaded]    com.oracle.java.Helper-Tool.plist Support
        [loaded]    com.oracle.java.JavaUpdateHelper.plist Support
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        [loaded]    com.adobe.ARM.[...].plist Support
        [loaded]    com.genieo.completer.download.plist Support
        [loaded]    com.genieo.completer.ltvbit.plist Support
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        Microsoft Database Daemon    Application (/Applications/Microsoft Office 2008/Office/Microsoft Database Daemon.app)
        Monitor    ApplicationHidden (/Applications/LeapFrogConnect.app/Contents/Monitor.app)
        Dropbox    Application (/Applications/Dropbox.app)
        TuneupMyMac    Application (/Applications/TuneupMyMac.app)
        EvernoteHelper    Application (/Applications/Evernote.app/Contents/Library/LoginItems/EvernoteHelper.app)
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        Google Earth Web Plug-in: Version: 6.0 Support
        Default Browser: Version: 537 - SDK 10.9
        Flip4Mac WMV Plugin: Version: 2.4.0.11 Support
        OfficeLiveBrowserPlugin: Version: 12.3.6 Support
        Unity Web Player: Version: UnityPlayer version 4.5.3f3 - SDK 10.6 Support
        Silverlight: Version: 5.1.30317.0 - SDK 10.6 Support
        FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
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        [running]    com.rim.BBDaemon.plist [Click for support]
        [running]    com.trusteer.rooks.rooksd.plist [Click for support]
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        apple-scc-20120306-133710    UNKNOWN  (missing value)
        AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
        Dropbox    Application  (/Applications/Dropbox.app)
        apple-scc-20131029-133449    UNKNOWN  (missing value)
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        HPEventHandler    UNKNOWN  (missing value)
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        Google Earth Web Plug-in: Version: 6.0 [Click for support]
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        Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
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             1%    launchd
             1%    LogMeInGUI
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             0%    discoveryd
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        566 MB    Wired RAM
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        29 KB    Page-outs
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        Feb 11, 2015, 11:42:49 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/VLC_2015-02-11-114249_[redacte d].crash
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    Hi
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    When I start my iMac 2008, appear something like folder with question mark inside

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