[Bug 50317] New: Unusable performance/system locks up in 3D applications since 5.14

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50317

Bug ID: 50317
           Summary: Unusable performance/system locks up in 3D
                    applications since 5.14
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Upon launching seemingly any intensive 3D application via wine the system
becomes unresponsive and Xorg has 100% CPU usage.

Arch Linux OS, Linux kernel 5.9, Nvidia GTX 970 proprietary drivers 455.45.01
Issue happens on any wine release since 5.14.
Issue goes away if I use the 'virtual desktop' mode. Possibly related, I use
two monitors.

Bisecting it leads to commit 5491e939bc22f0ab479aec6b8a525be9c5ff5e35
https://source.winehq.org/git/wine.git/commit/5491e939bc22f0ab479aec6b8a525b...