Stuttering/FPS Drop only in Ground Battles

This bug only affects me in Ground Battles. If I play 1 ground battle it’s constantly like this and restarting the game doesn’t even help! However if I only play Air Battles for the day I can play 6-10 hours without any stuttering or problems.

I have an Nvidia RTX 2060, Driver Version 552.22. I can play every single other game I have without any issues or FPS drops/Stuttering, even Starfield on near-max settings which even I was surprised about. However War Thunder is the issue here.