http://bugs.winehq.org/show_bug.cgi?id=24558
--- Comment #12 from Eric 8jmtfa1e@gmail.com 2010-11-09 03:20:11 CST --- It spends some time using RtlEnterCriticalSection. The functions is located among the top 10 most time consuming functions. The function can be found at "dlls/ntdll/critsection.c".
http://source.winehq.org/WineAPI/RtlEnterCriticalSection.html