It would be worth trying a manual/full uninstall of the Editing software. Once this is done, you can reinstall and see if the performance is improved.

These instructions will remove Licensing files as well as Avid License Control which could be dangerous if you have any other products installed!
PLEASE USE WITH CAUTION and PLEASE DEACTIVATE YOUR SOFTWARE AND OPTIONS BEFORE PERFORMING THESE STEPS!
   The Avid License tool (ALC) can be found in HD /Applications / Utilities / Avid_Utilities)


Below are the steps/files to remove your Editor software from the system. These should be done after running the Media Composer or Symphony Uninstaller located in the HD > Applications > Avid_Uninstallers folder.


A) From a Mac Terminal window (HD / Applications / Utilities) you’ll need to perform a "sudo" (which requires system password) to remove the below items.  (Replace "Symphony" for MediaComposer where appropriate)

** Note the 2 dashes in each command:
sudo pkgutil --forget com.avid.MediaComposerapplications.pkg
sudo pkgutil --forget com.avid.MediaComposerlibrary.pkg
sudo pkgutil --forget com.avid.MediaComposersystem.pkg
sudo pkgutil --forget com.avid.MediaComposeruninstaller.pkg
sudo pkgutil --forget com.avid.avidcodecspe
sudo pkgutil --forget com.avid.avidfilmscribe.pkg
sudo pkgutil --forget com.avid.avidlogexchange.pkg
sudo pkgutil --forget com.avid.edlmanager.pkg
sudo pkgutil --forget com.avid.sharedcomponents.pkg
sudo pkgutil --forget com.paceap.pkg.eden.licensed
sudo pkgutil --forget com.paceap.pkg.InterLokExtensions
sudo pkgutil --forget com.avid.licensecontrol.pkg
sudo pkgutil --forget com.avid.osx.utilities.pkg
sudo pkgutil --forget com.avid.DXDriver.pkg  
sudo pkgutil --forget com.avid.tmp.thirdparty.pkg
sudo pkgutil –-forget com.avid.tmp.pace.pkg
sudo pkgutil --forget com.avid.Interplay.EditorTranscode.pkg


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     B) In the newer operating systems we use the receipts database to track which items are installed. To see what pkgs(packages) are installed on your system please enter this command in the Mac Terminal window (HD / Applications / Utilities) 
** Note the 2 dashes in command:
pkgutil --pkgs|grep com.avid

If any Avid entries are listed, then please use the same "sudo" command above to remove those items (This does NOT INCLUDE any Avid Unity ISIS or MediaNetwork entries) 
sudo pkgutil --forget (item goes here, without parenthesis)


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    C) Folders/Files to manually remove from the system(if present)
1) HD /Applications / Avid / EditorTranscode
2) HD /Applications / Avid Media Composer (or Avid Symphony)
3) HD /Applications / Avid_Uninstallers / Avid Media Composer (or Avid Symphony)
4) HD /Applications / Utilities / Avid_Utilities  (**This will remove Avid License Control**)
5) HD /System / Extensions / Digi*.kext, Avid*.kext
6) HD /Library / CFMSupport / DigiCFMShim
7) HD /Library / Applications Support / Avid  (this will remove Avid Licensing files)
8) HD /Library / Applications Support / Digidesign
9) HD /Library / StartupItems / Digi*.*
10) HD /Library / LaunchAgents / com.avid.interplay.dmfservice.plist
11) HD /Library / LaunchAgents / com.avid.interplay.editortranscode.plist
12) HD /Library / LaunchAgents / com.avid.transcodeserviceworker.plis
13) HD /Library / LauchDaemons / com.avid.interplay.editorbroker.plist
14) HD /Library / LauchDaemons / com.avid.interplay.editortranscodestatus.plist


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     D) If the icon is still in the dock, you should be able to right+click and select "Remove from Dock."