[Bug 47431] New: Steam and wineserver too high CPU usage

https://bugs.winehq.org/show_bug.cgi?id=47431

Bug ID: 47431
           Summary: Steam and wineserver too high CPU usage
           Product: Wine
           Version: unspecified
          Hardware: x86
               URL: https://steamcdn-a.akamaihd.net/client/installer/Steam
                    Setup.exe
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 074abfe097e31d382772aaa5fc8fdee45bbc2656
      Distribution: ArchLinux

Created attachment 64778
  --> https://bugs.winehq.org/attachment.cgi?id=64778
terminal output

Steam.exe and the wineserver processes consume much more cpu power than they
used to, even when Steam is idling.
On my rather old system equipped with a dual-core AMD processor, htop shows
that Steam.exe constantly consumes 35-40% cpu power,  wineserver 55-60%. This
was tested with the game library page opened and while Steam was idling. Before
the regression: Steam.exe: 12-15%, wineserver: 5-6 %.
It's not just the Steam client that reacts more slowly to mouse input, e.g.
when browsing through the list of installed games, but every game started
inside Steam has a noticeable performance hit.

The commit that caused the problem:

commit 074abfe097e31d382772aaa5fc8fdee45bbc2656
Author: Zhiyi Zhang 
Date:   Tue Jun 25 16:38:38 2019 +0800

winex11.drv: Use generic EnumDisplayMonitors.

The problem happens both in Wine's fullscreen and virtual desktop mode. I have
a single monitor setup and using XFCE on Arch Linux.

wine-4.11-192-g90a1e5d943
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 730/PCIe/SSE2
OpenGL core profile version string: 4.6.0 NVIDIA 418.52.10