Hello.
I was having issues with redraws busy all the time, when opening up my projects and or after recording long sessions.
it seems now, after a rebuild of my system, and making absolutely sure of the slots in the MB shared states, and with what is being shared, and moving things off of controller / MSmedia HD controllers/and or turning off other device chips in the bios to free up shared states, even moving the video card off of the 1st slots with some of these controllers that cannot be turned off, has helped make my projects open faster, and redraws are now faster in the making, as my video and thunderbolt and HD controller was all shared via slot assignments...and only had the video card installed, with TB to test the setup, and it was ok, but not perfect....and wanting to add a card on the 1x pcie...having to consult the manual for shared or free slots brought me to the answers for my setups needed.
So not saying I am right, but for me, making absolutely sure everything from the ground up is in line first...otherwise it is a goose hunt.
Just trying to help...those asking for it....baby steps first.