Sadly all AMD users are experiencing these issues ... things that i didn't encounter with my old R9-290 during the Resolve 15 era.
1. Slow loading of video thumbnails at the start of the program... it takes minutes to load and to be able to edit anything. Until they load you can't use the program.
2. Issues with video files from Sony A7III 4K 25fps... it gets glitches while you start editing, doesn't happen if i use Optimized media.
3. The first time you use stabilizer it takes a while till it starts doing anything, after that it works instantly as expected.
4. While in dual screen mode (one screen full screen preview) If you happen to enable cinema mode on both by using Alt+F, the preview monitor stops refreshing the last frame sent.
Happens with all the drivers i have tested since November 2020.
Resolve Studio 16 (17 Beta is atrocious on Radeon, can't be used), even started a new clean database with new projects ... does the same.
5800X
32GB RAM
6800XT
Win 10 Home (even fresh install and all updates done)
Here is a video about 2 of the most dreadful symptoms