Basically, my PC can run War Thunder perfectly fine, but randomly, after I tab out and tab back in, my FPS tanks to around 6. After that, the game stays laggy and my GPU gets stuck at 100% usage. Restarting the game fixes it, but it happens way too often for that to be a reliable solution.
I’ve tried switching between Windowed, Fullscreen**, and Fullscreen Windowed sometimes it fixes it, sometimes it doesn’t. Here’s a clip of what the lag looks like.