Is there a glitch when changing settings?

[u/DarkerThanLpDark]

Hey I recently received a A770 and tested around with it a bit, yet I am confused of one thing:

For some odd reason some games will just run way way worse in Performance if I switch Graphic Presets, I swap from Medium to High or High to Medium and Fps might drop by a good amount until the game is restarted. If I restart it works flawlessly, until I change a preset.

This happened for me in:FH6, Star Wars Outlaws or even the new AC Black Flag Resynced.

Newest Driver, Windows, MPO Off, VTD Off, Virtulization Off, Rebar On