[Bug 53382] New: Slow rendering when connected to external monitor

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53382

Bug ID: 53382
           Summary: Slow rendering when connected to external monitor
           Product: Wine
           Version: 7.13
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 72769
  --> https://bugs.winehq.org/attachment.cgi?id=72769
Slow winecfg GIF

When connected with an external monitor through HDMI, winecfg and explorer are
extremely slow rendering.

If enabled "Emulate a virtual desktop", rendering will become normal. Without
connecting on external monitor, the rendering is normal as well.

There is an error message shown in console when the rendering is slow comparing
to the normal rendering,

0068:fixme:xrandr:xrandr10_get_current_mode Non-primary adapters are
unsupported.

OS: Arch Linux