I've been getting stutter in zombies even with the frame rate hovering at 58-60 FPS, but generally only at the beginning of the level. It doesn't appear to stutter when it gets really busy, just drops the frame rate to the high forties, but there are definitely optimisation issues currently.
Few people have complained that they are facing stuttering issues on 8 Gb RAM pc. We recommend you to go for atleast 12 GB RAMThat's bonkers for a game that is not pushing any boundaries whatsoever.
I've also noticed an issue with the timer in custom bot matches. I've only played two fifteen minute games and both lasted for one hour!