Low FPS after Alt-tab

So basically the game runs fine (60+ fps) but when i tab out and tab back in i get 9 fps and wont get fixed until i restart my pc.

i got :
i5 3550k
8gb ram
560 TI

My friend. After I Alt Tab, I have to restart my game XD

I am not sure this is fixable, it is due to your system configuration. Also, the game runs on an engine (Unity) and therefore it’s out of Facepunch’s hands.