In the fight with the 4 gnolls (gnoll fang of yeenoghu, 2 gnoll hunter and gnoll flesh gnawer)

The game will go stutter like mad (almost freeze) after a few rounds.
I noticed that casting mage hand would start the process (tried twice) but it will also start just from trying to do a normal attack.

I did manage to win and move on, but I had 5 reloads due to the unstability. I have not encountered similar anywhere else so far.