Severe FPS drops and stuttering in lobby after launching the game

Hello,

I am experiencing a serious performance issue after launching the game.
Already in the lobby I get constant FPS drops from around 160 FPS down to 20 FPS, happening repeatedly in a loop. This causes noticeable stuttering and short freezes.

About six months ago the game was working perfectly fine on the same system, and I was able to play smoothly on maximum graphics settings. Currently, the FPS drops occur even on the lowest possible graphics settings, which makes the issue even more confusing.

I have not made any major hardware changes since then, so I am not sure what could be causing this problem.

In the attachment I am providing:

  • HWiNFO log recorded during the issue (packed as ZIP)
  • Video recording showing how the FPS drops look in practice

I would appreciate any help or guidance on how to resolve this problem.
warthunder fps drops.zip (21.7 KB)
https://drive.google.com/file/d/1RFkriYjlIJWcj_xQ6etpIw69avjgOfaV/view?usp=sharing - video

What device do you use? is it a laptop by any chance?

pc
rtx3070
ryzen 7 5800x
32gb of ram