[Bug 48029] New: server-Key_State patchset causes massive slowdowns now

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48029

Bug ID: 48029
           Summary: server-Key_State patchset causes massive slowdowns now
           Product: Wine-staging
           Version: 4.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail]
      Distribution: ---

Since awhile - though I'm not sure when exactly it began (I vaguely recall
seeing a commit on the chat, that gave me a feeling it will affect this
patchset, but I can't recall which exactly commit it was; most likely it was
within last 2-3 months) server-Key_State patchset started to introduce
significant slowdowns.

Yet it's a bit more complicated.

With the patchset reverted, slowdowns become less frequent (though they still
happen), but when they happen, keyboard becomes unresponsive. That is while it
seems no keyboard events are lost, the whole queue becomes delayed by
*minutes*.
What's more, while mouse and video also get affected by the slowdown, the delay
there is several times lower (probably closer to seconds than minutes).