Apparently this playtest build had memory leak around VoIP code - memory usage was growing each frame, after some threshold GC started kicking in (I'm guessing that cuz I had no tools to validate it), which caused ♥♥♥♥♥♥♥♥ of stuttering because it tried to cleanup a lot of now-unused memory objects which occupied few gigs. It can be caused by a single line of code sometimes, so chances are that it's not something fundamental (when you disable the VoIP you could play for 15+ mins instead of 1-2, memory usage increase was way slower that way). Also I think new particles could have a bit of adjustment because they introduce hiccups sometimes (and there's no video setting to adjust them yet).

Given how many gameplay issues they've finally addressed in this build I doubt they're unable to fix this stuff, and I hope we'll get another playtest soon (I personally liked the gameplay changes so far).

4 hours at 2 fps .. its gonna be a banger