The trick is to add the following to a game's launch options in Steam:
RADV_PERFTEST=gpl %command%
This totally and completely eliminated shader cache stutter for me in Resident Evil Revelations, with a cleared shader cache. Prior to doing this the game stuttered every time I fired a gun or entered a new area.
The trick does not work on DX12 games.
Gosh and they hoped to be Verified by launch?
I really hope Larian and Valve sort this out. I personally don't mind doing a bunch of tweaks but its going to annoy my wife and others if they cant install or update without thinking about it.