Sudden low fps issue

I’ve been playing war thunder since 2021. The game was fine with 20 fps which is amazing for me. Suddenly when i played war thunder on a random day and it ran at 11 fps. Is this windows 11 issue or war thunder issue? I haven’t changed anything since i started playing it so if there is anything you can help, tell me please.

oh yes i forgot, this is after la royale update. After the update i also have render issue like multiple black spots on the map and smoke when the enemy is killed