http://bugs.winehq.org/show_bug.cgi?id=21165
--- Comment #8 from Dmitry Timoshkov dmitry@codeweavers.com 2009-12-30 07:27:49 --- (In reply to comment #7)
Is there any way to compare system call responses between Windows and Linux runs?
That won't help. You may want to try oprofile to try to figure out where most of the slowness is.