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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).