Same here, was running brilliantly through Wine, no problems what so ever... even went through the hassle of comparing the FPS between Linux and Windows, turns out Linux just stole the win with a general increase of 10 fps in all situations.
Shame such a large and influential company would actively block users purely down to the platform they're using.
Yeah, I noticed the performance drop, as well. On Linux, I had my settings on high for everything with 60fps as my dynamic resolution render target and I only ever noticed the resolution decrease whenever a lot of things were happening on screen. Now that I'm forced to play on Windows, small things like jumping at the start of a match or being in a firefight cause my resolution to dip.
It really is a shame, and I hope something gets done about this.
