I maxed out my zealot and veteran. The performance on my pc was pretty good and without issue aside from the occasional crashes. I decided that i want to try the psycker and my pc performance dropped so much. I thought that maybe the staff was the reason for it because of the particle effects. I tried with a gun as well and it was basically the same. Was curious if anyone had experience an issue similar to this one.
No issue. Have a level 30 veteran, zealot, and psyker. All play like butter.