[Bug 55500] New: Launching new processes in Virtual Desktops is slow and stutters the system

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55500

Bug ID: 55500
           Summary: Launching new processes in Virtual Desktops is slow
                    and stutters the system
           Product: Wine
           Version: 8.14
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

When in Virtual Desktop mode, launching any processes (even start.exe) causes a
short burst of high GPU usage, at least with NVIDIA drivers. This happens
because of vkGetRandROutputDisplayEXT, which seems to be very expensive, and
it's supposed to be done only once per wineserver launch, but that doesn't work
in Virtual Desktop mode because it always calls get_host_primary_monitor_rect
which ends up calling that function, even though it only needs the ID.

This actually can cause huge graphical stutters/lag of half a second when
launching processes in a Virtual Desktop.