GTA5 Rockstar Games Launcher broken - 5700 XT and 3700X

I installed the launcher via Lutris, I had the launcher install the game and for some weird reason I have 99% GPU load but a FPS of around 10. Settings are pretty much maxed out on a 5700 XT, 3700X and 32 GB fast RAM. In the menu the mouse feels incredibly laggy even though the FPS is around 64. I have no idea how to debug this. Are there known issues with this game which I could look at? I let Lutris do its thing and I have the latest Wine-staging. Other games run without any issue on Lutris.

A bit more information now. For some weird reason twice (second time after starting up the game again!) the benchmark gave around 10 FPS and the third time it was around 40-60 but a stuttery mess, to the extend that I can see it with my naked eye. However, I also use MangoHud to get detailed information. Interesting is that the FPS dropped from 50-60 to 10 when cops started to shoot during the benchmark. I use the new aco-compilers but those haven’t given any problem with other games…