https://bugs.winehq.org/show_bug.cgi?id=29582
--- Comment #54 from Chris schM0ggi@web.de --- I ran some tests with Proton. I can happily say, that using Proton (current 7.0.6) does fix it completely. Loading times are fast and on the same level like in Windows. No more problems regarding joining games.
I did also a test with the current custom wine_ge build. https://github.com/GloriousEggroll/wine-ge-custom
Loading times are much lower than with with vanilla Wine-staging 8.2, but not as quick as with Proton. But more importantly, with wine-ge, I guess due to the fast enough loading times, joining a game does work without problems.
I ran my tests with several bigger maps like Hoth, where loading times with vanilla Wine were the longest.
Strongly advise, that wine devs talk to Valve and/or Glorious about that.