So going to try to beat the witcher 1 finally.

Just going to use:

1. Flash Mod
2. Scabbard mod
3. Extreme immersion mod.

Problem is last time I tried to play the game I got a ton of frame rate drops, that seemed like stutters but slightly less common and more severe. I know the game isn't well optimized, but is there anything I can do about it?

yep, don't use mods.

I dont think the mods are the problem.

My PC is not the fastest machine... but the FPS jumping from 120 to 15 and back. Most of the time i am around 50-60 FPS but the massiv drops are annoying. All without any mods.

Iam playing in medium Settings with a Ryzen 3 2200G.