http://bugs.winehq.org/show_bug.cgi?id=58492
--- Comment #9 from Stian Low wineryyyyy@gmail.com --- (In reply to Stian Low from comment #8)
The bug seems fixed by proton-ge-custom release 10.11 (only release I tested): https://github.com/GloriousEggroll/proton-ge-custom/releases
Seems there's a fix by winetricks and/or wine-staging changes
Vanilla proton also offers a convenient workaround through steam.
So GE-Proton just inherits the existing workaround from vanilla proton.
To workaround this issue for now: 1. Click LIBRARY at the top left of Steam client 2. Click "+ Add a Game" button at the bottom left 3. Choose "Add a Non-Steam Game" 4. Click Browse and add Prism Cross.exe 5. Click "Add Selected Program" 6. Right click Prism Cross.exe just added to the game list 7. Click Properties in the right-click menu 8. Click Compatibility tab 9. Check mark "Force the use of a specific Steam Play compatibility tool" 10. Choose "Proton Experimental" from the list
After step 10 just close the properties window the click the Play button for Prism Cross.exe
The game should launch for you to verify that the scenario that causes lagging and flashing has been resolved by proton.
This issue should remain open even if proton is a workround because it means vanilla wine still has broken rendering components for opengl, etc.