http://bugs.winehq.org/show_bug.cgi?id=421
--- Comment #36 from Dmitry Timoshkov dmitry@codeweavers.com 2008-03-27 10:46:12 --- (In reply to comment #34)
In fact, the reason I'm interested in fixing this is Heroes of Might & Magic IV working under wine (not like a slide-show as it is now).
How have you identified that the slowness in that game is caused by a lack of DIB engine? Do you have any profiler statistics?