have you tried the… aeh forget what it’s called for linux, but like cpu affinity reset someone mentioned elsewhere
or, have you checked if it’s a sound related thing? - i recall seeing some linux users having it be an issue with the game and their sound frequency iirc
*edit, sound channel stuff What helped me to fix FPS and freeze issues on Linux :: Grim Dawn General Discussions and linux taskset CPU affinity is only being set to use 1 core