Very slow listbox in search results

The listbox for the search results is very unresponsive under Windows Server 2008 R2 x64. The program appears to hang if many search results come in. If I need to scroll the box sideways to read it, it is very sluggish. This problem did not happen under Server 2003. I suspect it may have to do with some GDI hardware acceleration having been removed. This is under the Windows Classic theme. I don't have desktop composition installed and can't try the Vista theme. The file list view is ok.

I have disabled smooth scrolling everywhere, but these kind of listboxes do not follow that setting, and they are still smooth (and slow).

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