Question about perfomance

Ok, im new here. And i’m not very smart. And don’t really know where to ask. But is this supposed to run this bad on AMD stuff?
I’m just got a new pc, RX 6600 xt, and ryzen 5 5500. 16gb RAM. No overclocking.
And sometimes this runs really-really bad. Especially in SR.
Like, in other games my main problem is overheating, but they’re runs fine 100+ frames (last epoch, wolcen, drg what I tried for now).
Here, it runs at 120+ in towns, around 80 in fights, and in big mess it can drop to 12 frames. And I have zero idea why. Is it engine? Is it drivers? idk. If anyone got any advice - please help. And I’m sorry for making you reading this.

take a look at this and see if it has any helpful tips for you

i will mention this too, which another AMD user mentioned
set ryzen powerplan to "high performance"mode