http://bugs.winehq.org/show_bug.cgi?id=21379
Nikolay Sivov bunglehead@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Component|-unknown |comctl32
--- Comment #3 from Nikolay Sivov bunglehead@gmail.com 2010-01-15 16:21:08 --- (In reply to comment #2)
commit c2a7535e9d112989abe687255b4f0da9a597678e Author: Nikolay Sivov bunglehead@gmail.com Date: Wed Dec 9 15:17:12 2009 +0300
comctl32/listview: Update item width every time new item is inserted. This prevents retaining previously stored width and unexpected item displaying collapsing with ending ellipsis.
Could be a cause indeed. With this patch a whole loop executed at each insert. I think a kind of marking item dimensions dirty (to delay recalculation when it's time to paint) could be a solution.
Did you try to revert it?
P.S. Using report mode should be faster actually.