https://bugs.winehq.org/show_bug.cgi?id=42040
--- Comment #2 from smilzoboboz@gmail.com --- Disabling the output with WINEDEBUG=-all changes nothing (I usually launch my games with the -all parameter if I'm not "debugging").
What I tried to do was to enable timestamps to check if there were any fixme messages appearing when I created/entered online lobbies, but there were none. The +fps just shows a bunch of 59/60 untile it suddenly reaches 22~30 and then 6~8 when I open any in-game menu from that lobby.
My GPU is an NVIDIA GTX 1060 using the binary blob, I had the exact same issue with my old GTX 750 card so I guess driver version is not of any use (still right now it's the latest).