[Bug 30255] New: Degraded rendering performance with theme in use

http://bugs.winehq.org/show_bug.cgi?id=30255

Bug #: 30255
           Summary: Degraded rendering performance with theme in use
           Product: Wine
           Version: 1.5.0
          Platform: x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: uxtheme
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Steps to reproduce:

1. Download a XP theme, like Human for Windows [1] or Clearlooks for Windows XP
[2] and unzip it.
2. Run `winecfg`. In the "Desktop Integration" tab, install the theme, choose
it, and click "apply".
3. Switch between the tabs of winecfg and observe the performance. There is an
obvious lag when switching tabs, which is not present when "(No Theme)" is
chosen. Also, there is `fixme:msg:pack_message msg 14 (WM_ERASEBKGND) not
supported yet` in the console output.

Additional notes:

Bug 19263 could be merged into this one.

References:

1. http://fioressj.deviantart.com/art/Human-for-Windows-37743373, as mentioned
in http://wiki.winehq.org/XPThemes
2. http://schmoove.deviantart.com/art/ClearLooks-for-Windows-XP-18591720