Itunes playback performance issue

All my iTunes library files are kept on the Airport extreme and so every time I play a movie, it skips, stutters, loses sound here and there, it's getting quite annoying. I noticed that if a movie is projected to the big screen using apple TV, it will buffer like a youtube video and plays absolutely fine. Also, if I go directly to the folder and right-click on the file, play with VLC, there is no problem. It would appear to me that the problem is with iTunes' playback of videos on my Airport Extreme.
Does anybody have the same problem and is there a solution?

I can only offer you a sympathetic shoulder to cry on.
I'm not using an air disk. I'm using a hard drive on an old G3 that I use to serve my music library to my laptop as a wander throughout the house. I have it set up this way because I also have the G3 hooked up to a stereo system that can pump music to various locations of the house. So both machines need access to the library, as well as the playlists, rating histories, playback counts, etc., so that my smart playlists can have the same data to work from.
Anyway, I'm having this same issue. Both computers are constantly wanting to scan for gapless playback. I've let them both finish scanning my entire library numerous times, but it doesn't help, they want to scan it again and again, every time I launch iTunes. If I cancel the process, it will likely try to start again a few minutes later.
This only happened after I installed iTunes 9. I'm ripping my hair out over this issue. Give me back the music library that I know and love please.

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    Problem description:
    slow start and slow quit of computer. Performance issues with fcpx and other programms.
    EtreCheck version: 2.1.8 (121)
    Report generated 6 maart 2015 21:49:31 CET
    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
        iMac (27-inch, Mid 2011) (Technical Specifications)
        iMac - model: iMac12,2
        1 3.4 GHz Intel Core i7 CPU: 4-core
        16 GB RAM Upgradeable
            BANK 0/DIMM0
                4 GB DDR3 1333 MHz ok
            BANK 1/DIMM0
                4 GB DDR3 1333 MHz ok
            BANK 0/DIMM1
                4 GB DDR3 1333 MHz ok
            BANK 1/DIMM1
                4 GB DDR3 1333 MHz ok
        Bluetooth: Old - Handoff/Airdrop2 not supported
        Wireless:  en1: 802.11 a/b/g/n
    Video Information: ℹ️
        AMD Radeon HD 6970M - VRAM: 1024 MB
            iMac 2560 x 1440
    System Software: ℹ️
        OS X 10.9.4 (13E28) - Time since boot: 0:7:46
    Disk Information: ℹ️
        WDC WD1001FALS-403AA0 disk1 : (1 TB)
            EFI (disk1s1) <not mounted> : 210 MB
            MacintoshHD2  (disk1s2) /Volumes/MacintoshHD2  : 999.86 GB (152.18 GB free)
        APPLE SSD TS256C disk0 : (251 GB)
            EFI (disk0s1) <not mounted> : 210 MB
            MacintoshHD (disk0s2) / : 250.14 GB (62.78 GB free)
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        HL-DT-STDVDRW  GA32N
    USB Information: ℹ️
        Apple Inc. FaceTime HD Camera (Built-in)
        Mitsumi Electric Hub in Apple Extended USB Keyboard
            Logitech USB-PS/2 Optical Mouse
            Mitsumi Electric Apple Extended USB Keyboard
        Western Digital Ext HDD 1021 2 TB
            EFI (disk2s1) <not mounted> : 210 MB
            datavideo (disk2s2) /Volumes/datavideo : 1.37 TB (133.89 GB free)
            prive (disk2s3) /Volumes/prive : 627.23 GB (68.13 GB free) - 7 errors
        Apple Inc. BRCM2046 Hub
            Apple Inc. Bluetooth USB Host Controller
        Lexar  USB_3_0 Reader
        Seagate  Expansion Desk 3 TB
            EFI (disk3s1) <not mounted> : 315 MB
            downloads (disk3s2) /Volumes/downloads : 249.18 GB (138.35 GB free)
            BackUpBro (disk3s3) /Volumes/BackUpBro : 2.75 TB (1.03 TB free)
        Apple Internal Memory Card Reader
        Apple Computer, Inc. IR Receiver
    Thunderbolt Information: ℹ️
        Apple Inc. thunderbolt_bus
            G-Technology G-RAID with Thunderbolt
    Configuration files: ℹ️
        /etc/sysctl.conf - Exists
    Gatekeeper: ℹ️
        Mac App Store and identified developers
    Kernel Extensions: ℹ️
            /Applications/Toast 11 Titanium/Spin Doctor.app
        [not loaded]    com.hzsystems.terminus.driver (4) [Click for support]
            /Library/Extensions
        [not loaded]    com.Avid.driver.AvidDX (5.9.1 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.desktopvideo.iokit.driver (10.1.4 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.desktopvideo.iokit.framebufferdriver (10.1.4 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.desktopvideo.multibridge.iokit.driver (10.1.4 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.driver.BlackmagicIO (10.1.4 - SDK 10.8) [Click for support]
            /Library/Extensions/DeckLink_Driver.kext/Contents/PlugIns
        [not loaded]    com.blackmagic-design.desktopvideo.firmware (10.1.4 - SDK 10.8) [Click for support]
            /System/Library/Extensions
        [not loaded]    at.obdev.nke.LittleSnitch (3876 - SDK 10.8) [Click for support]
        [not loaded]    com.SafeNet.driver.Sentinel (7.5.2) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.master (5.9.1 - SDK 10.6) [Click for support]
        [not loaded]    com.roxio.BluRaySupport (1.1.6) [Click for support]
            /System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
        [not loaded]    com.paceap.kext.pacesupport.leopard (5.9.1 - SDK 10.4) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.panther (5.9.1 - SDK 10.-1) [Click for support]
        [loaded]    com.paceap.kext.pacesupport.snowleopard (5.9.1 - SDK 10.6) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.tiger (5.9.1 - SDK 10.4) [Click for support]
            /Users/[redacted]/Library/Services/ToastIt.service/Contents/MacOS
        [not loaded]    com.roxio.TDIXController (2.0) [Click for support]
    Startup Items: ℹ️
        Digidesign Mbox 2: Path: /Library/StartupItems/Digidesign Mbox 2
        DigidesignLoader: Path: /Library/StartupItems/DigidesignLoader
        Startup items are obsolete in OS X Yosemite
    Problem System Launch Agents: ℹ️
        [running]    com.paragon.NTFS.notify.plist [Click for support]
    Launch Agents: ℹ️
        [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
        [loaded]    com.adobe.CS4ServiceManager.plist [Click for support]
        [loaded]    com.avid.ApplicationManager.plist [Click for support]
        [loaded]    com.avid.backgroundservicesmanager.plist [Click for support]
        [loaded]    com.avid.dmfsupportsvc.plist [Click for support]
        [loaded]    com.avid.interplay.dmfservice.plist [Click for support]
        [loaded]    com.avid.interplay.editortranscode.plist [Click for support]
        [loaded]    com.avid.transcodeserviceworker.plist [Click for support]
        [running]    com.blackmagic-design.DesktopVideoFirmwareUpdater.plist [Click for support]
        [failed]    com.brother.LOGINserver.plist [Click for support] [Click for details]
        [loaded]    com.paragon.updater.plist [Click for support]
        [failed]    com.teamviewer.teamviewer.plist [Click for support] [Click for details]
        [failed]    com.teamviewer.teamviewer_desktop.plist [Click for support]
    Launch Daemons: ℹ️
        [loaded]    com.adobe.fpsaud.plist [Click for support]
        [loaded]    com.adobe.SwitchBoard.plist [Click for support]
        [loaded]    com.adobe.versioncueCS4.plist [Click for support]
        [loaded]    com.avid.AMCUninstaller.plist [Click for support]
        [running]    com.avid.interplay.editorbroker.plist [Click for support]
        [running]    com.avid.interplay.editortranscodestatus.plist [Click for support]
        [loaded]    com.blackmagic-design.desktopvideo.XPCService.plist [Click for support]
        [running]    com.blackmagic-design.DesktopVideoHelper.plist [Click for support]
        [running]    com.blackmagic-design.streaming.BMDStreamingServer.plist [Click for support]
        [not loaded]    com.digidesign.fwfamily.helper.plist [Click for support]
        [running]    com.edb.launchd.postgresql-8.4.plist [Click for support]
        [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
        [loaded]    com.noiseindustries.FxFactory.FxPlug.plist [Click for support]
        [loaded]    com.noiseindustries.FxFactory.plist [Click for support]
        [running]    com.paceap.eden.licensed.plist [Click for support]
        [loaded]    com.teamviewer.Helper.plist [Click for support]
        [failed]    com.teamviewer.teamviewer_service.plist [Click for support]
        [loaded]    jp.co.canon.MasterInstaller.plist [Click for support]
        [loaded]    PACESupport.plist [Click for support]
    User Login Items: ℹ️
        iTunesHelper    Programma Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Internet Plug-ins: ℹ️
        Default Browser: Version: 537 - SDK 10.9
        OfficeLiveBrowserPlugin: Version: 12.2.6 [Click for support]
        AdobePDFViewerNPAPI: Version: 11.0.0 - SDK 10.6 [Click for support]
        FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        Silverlight: Version: 5.1.30514.0 - SDK 10.6 [Click for support]
        Flash Player: Version: 16.0.0.305 - SDK 10.6 [Click for support]
        QuickTime Plugin: Version: 7.7.3
        iPhotoPhotocast: Version: 7.0 - SDK 10.8
        SharePointBrowserPlugin: Version: 14.0.0 [Click for support]
        AdobePDFViewer: Version: 11.0.0 - SDK 10.6 [Click for support]
        EPPEX Plugin: Version: 10.0 [Click for support]
        JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
    User internet Plug-ins: ℹ️
        Google Earth Web Plug-in: Version: 7.0 [Click for support]
    Audio Plug-ins: ℹ️
        DVCPROHDAudio: Version: 1.3.2
    3rd Party Preference Panes: ℹ️
        Blackmagic Desktop Video  [Click for support]
        DigidesignMbox2  [Click for support]
        Digidesign Mbox 2 Pro  [Click for support]
        Flash Player  [Click for support]
        Paragon NTFS for Mac ® OS X  [Click for support]
    Time Machine: ℹ️
        Skip System Files: NO
        Mobile backups: OFF
        Auto backup: NO - Auto backup turned off
        Volumes being backed up:
            MacintoshHD: Disk size: 250.14 GB Disk used: 187.36 GB
            downloads: Disk size: 249.18 GB Disk used: 110.84 GB
        Destinations:
            G-RAID with Thunderbolt [Local]
            Total size: 8.00 TB
            Total number of backups: 6
            Oldest backup: 2014-04-08 14:24:41 +0000
            Last backup: 2014-09-24 21:58:28 +0000
            Size of backup disk: Excellent
                Backup size 8.00 TB > (Disk size 499.32 GB X 3)
    Top Processes by CPU: ℹ️
             2%    Google Chrome
             1%    WindowServer
             0%    opendirectoryd
             0%    mds
             0%    dpd
    Top Processes by Memory: ℹ️
        206 MB    mds_stores
        172 MB    com.apple.IconServicesAgent
        155 MB    Google Chrome
        137 MB    Dock
        113 MB    Google Chrome Helper
    Virtual Memory Information: ℹ️
        10.02 GB    Free RAM
        4.36 GB    Active RAM
        1.35 GB    Inactive RAM
        1.44 GB    Wired RAM
        1.24 GB    Page-ins
        0 B    Page-outs
    Diagnostics Information: ℹ️
        Mar 6, 2015, 09:37:26 PM    Self test - passed
        Mar 6, 2015, 08:15:56 PM    /Library/Logs/DiagnosticReports/Mail_2015-03-06-201556_[redacted].hang

    Problem description:
    disk problems
    EtreCheck version: 2.1.8 (121)
    Report generated 7 maart 2015 14:16:18 CET
    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    Hardware Information: ℹ️
        iMac (27-inch, Mid 2011) (Technical Specifications)
        iMac - model: iMac12,2
        1 3.4 GHz Intel Core i7 CPU: 4-core
        16 GB RAM Upgradeable
            BANK 0/DIMM0
                4 GB DDR3 1333 MHz ok
            BANK 1/DIMM0
                4 GB DDR3 1333 MHz ok
            BANK 0/DIMM1
                4 GB DDR3 1333 MHz ok
            BANK 1/DIMM1
                4 GB DDR3 1333 MHz ok
        Bluetooth: Old - Handoff/Airdrop2 not supported
        Wireless:  en1: 802.11 a/b/g/n
    Video Information: ℹ️
        AMD Radeon HD 6970M - VRAM: 1024 MB
            iMac 2560 x 1440
    System Software: ℹ️
        OS X 10.9.4 (13E28) - Time since boot: 0:19:51
    Disk Information: ℹ️
        WDC WD1001FALS-403AA0 disk1 : (1 TB)
            EFI (disk1s1) <not mounted> : 210 MB
            MacintoshHD2  (disk1s2) /Volumes/MacintoshHD2  : 999.86 GB (152.18 GB free)
        APPLE SSD TS256C disk0 : (251 GB)
            EFI (disk0s1) <not mounted> : 210 MB
            MacintoshHD (disk0s2) / : 250.14 GB (62.97 GB free)
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        HL-DT-STDVDRW  GA32N 
        HGST HDS724040ALE640 disk2 : (4 TB)
            EFI (disk2s1) <not mounted> : 210 MB
            disk2s2 (disk2s2) <not mounted> : 4.00 TB
            Boot OS X (disk2s3) <not mounted> : 134 MB  - one error
        HGST HDS724040ALE640 disk3 : (4 TB)
            EFI (disk3s1) <not mounted> : 210 MB
            disk3s2 (disk3s2) <not mounted> : 4.00 TB
            Boot OS X (disk3s3) <not mounted> : 134 MB
    USB Information: ℹ️
        Mitsumi Electric Hub in Apple Extended USB Keyboard
            Logitech USB-PS/2 Optical Mouse
            Mitsumi Electric Apple Extended USB Keyboard
        Apple Inc. BRCM2046 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Inc. FaceTime HD Camera (Built-in)
        Lexar  USB_3_0 Reader 
        Seagate  Expansion Desk 3 TB
            EFI (disk5s1) <not mounted> : 315 MB
            downloads (disk5s2) /Volumes/downloads : 249.18 GB (138.35 GB free)
            BackUpBro (disk5s3) /Volumes/BackUpBro : 2.75 TB (1.03 TB free)
        Apple Computer, Inc. IR Receiver
        Apple Internal Memory Card Reader
    Thunderbolt Information: ℹ️
        Apple Inc. thunderbolt_bus
            G-Technology G-RAID with Thunderbolt
    Configuration files: ℹ️
        /etc/sysctl.conf - Exists
    Gatekeeper: ℹ️
        Mac App Store and identified developers
    Kernel Extensions: ℹ️
            /Applications/Toast 11 Titanium/Spin Doctor.app
        [not loaded]    com.hzsystems.terminus.driver (4) [Click for support]
            /Library/Extensions
        [not loaded]    com.Avid.driver.AvidDX (5.9.1 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.desktopvideo.iokit.driver (10.1.4 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.desktopvideo.iokit.framebufferdriver (10.1.4 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.desktopvideo.multibridge.iokit.driver (10.1.4 - SDK 10.8) [Click for support]
        [not loaded]    com.blackmagic-design.driver.BlackmagicIO (10.1.4 - SDK 10.8) [Click for support]
            /Library/Extensions/DeckLink_Driver.kext/Contents/PlugIns
        [not loaded]    com.blackmagic-design.desktopvideo.firmware (10.1.4 - SDK 10.8) [Click for support]
            /System/Library/Extensions
        [not loaded]    at.obdev.nke.LittleSnitch (3876 - SDK 10.8) [Click for support]
        [not loaded]    com.SafeNet.driver.Sentinel (7.5.2) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.master (5.9.1 - SDK 10.6) [Click for support]
        [not loaded]    com.roxio.BluRaySupport (1.1.6) [Click for support]
            /System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
        [not loaded]    com.paceap.kext.pacesupport.leopard (5.9.1 - SDK 10.4) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.panther (5.9.1 - SDK 10.-1) [Click for support]
        [loaded]    com.paceap.kext.pacesupport.snowleopard (5.9.1 - SDK 10.6) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.tiger (5.9.1 - SDK 10.4) [Click for support]
            /Users/[redacted]/Library/Services/ToastIt.service/Contents/MacOS
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        [loaded]    com.adobe.versioncueCS4.plist [Click for support]
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              [not loaded] com.cisco.nke.ipsec (2.0.1) Support
              [not loaded] com.leapfrog.codeless.kext (2) Support
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              [not loaded] com.rim.driver.BlackBerryUSBDriverInt (0.0.39) Support
              [not loaded] com.rim.driver.BlackBerryUSBDriverVSP (0.0.39) Support
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              [not loaded] com.adobe.AAM.Updater-1.0.plist Support
              [loaded] com.adobe.CS5ServiceManager.plist Support
              [running] com.brother.LOGINserver.plist Support
              [running] com.google.keystone.agent.plist Support
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              OfficeLiveBrowserPlugin: Version: 12.2.9 Support
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              SharePointBrowserPlugin: Version: 14.3.9 - SDK 10.6 Support
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              AirPlay: Version: 2.0 - SDK 10.9
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              Move_Media_Player: Version: npmnqmp 071705000010 Support
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              39 MB          Finder
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              499 MB          Active RAM
              481 MB          Inactive RAM
              465 MB          Wired RAM
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