Constant FPS Stutters and Drops

I join a battle and I have 100FPS. I play for 15 seconds and it starts going from 25FPS to 50FPS like crazy and causing ridiculous lag, stutters, freezes, etc.

How do I fix this?


Performance is TERRIBLE, new update literally ruined the game. You start playing with fine FPS and after some time it becomes unplayable. Devs please fix this issue ASAP

yeah have same issue, despite gaijin saying they fixed it, legit makes me feel slighlty sick, tho for me it is just constant stuttering (drops to super low FPS for a split second and back to over 100)