Severe fps drops after minimizing the game

If I minimize Overwatch and then open it again, I experience impossible FPS drops, down to 15… with 3 dots, as it shows ingame. It’s like a trojan horse, while being normal in menus, it’s absolutely impossible to play when the match starts, I have to abandon by alt+F4.
It fixes after I launch the game again, but it’s a major issue. I can’t switch to discord or a browser while waiting in a queue or the next game is pretty much ruined.

2 Things.
A. Have you tried using discord overlay, or some other overlay? that would remove the need to minimize the game if you cant find a fix.
B. Are you switching to windowed fullscreen?

I tried playing both windowed and fullscreen, both result in this problem.