[Bug 45072] New: Wine 3.6 causes 100% CPU use in MikuMikuDance

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=45072

            Bug ID: 45072
           Summary: Wine 3.6 causes 100% CPU use in MikuMikuDance
           Product: Wine
           Version: 3.6
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: myjunkmail311006 at gmail.com
      Distribution: ---

In wine-3.6 (Ubuntu 3.6-1), running MikuMikuDance, an animation program, causes
MikuMikuDance to stay at 100% CPU use (one CPU core).

In wine-3.0 (Ubuntu 3.0-1ubuntu1), it's at 21% CPU use under the same
conditions, which is with nothing loaded and not rendering any frames using the
'save power' mode under View menu. with 'save power' mode turned off, it's at
31% CPU while rendering the coordinate axes at 58 fps.

In Wine 2.18, it used the same or less CPU as in 3.0.

I know the guidelines say to run a regression test but I don't think I could
compile wine successfully; I'm using the Ubuntu 18.04 stable and development
packages.

This happens with a default Wine install, which is enough to run 32-bit MMD
without the addon MikuMikuEffect. (Installing a specific version of Visual C++
2008 may be necessary to get 64-bit MMD to run at all.)

(With my CPUs set to lowest frequency, MMD goes to 50% CPU in 'top' with Wine
3.0. With Wine 3.6, MMD goes from 60~100% CPU at maximum frequency to 100~115%
CPU at 1/3 frequency.)

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