http://bugs.winehq.org/show_bug.cgi?id=22478
--- Comment #28 from GyB gyebro69@gmail.com 2010-05-05 12:31:21 --- (In reply to comment #26)
Please give current git a try, there's a good chance ed75f5ca7aae3de6afeca5dc97be9f54a140104d will have fixed this.
In the current git (wine-1.1.43-564-g1af1784) the issue, that caused the excessive slowdown for me, is no longer present. Thank you.