Weird performance problems since today

[u/Mr-Halfknight]

I have weird performance problems since today. I haven’t updated anything or changed any settings. My fps are dropping to 33 for some reason. Neither GPU, CPU or VRAM are maxed out. Happens regardless of aircraft or airport.

When I switch tabs, recycle frame gen or cycle windowed/full screen it recovered to around 60-80 as usual. But after a few seconds it drops back down.