http://bugs.winehq.org/show_bug.cgi?id=31365
--- Comment #2 from Qba qbanin@gmail.com 2012-07-31 08:26:35 CDT --- "Not major, see http://bugs.winehq.org/page.cgi?id=fields.html#importance"
Ups, sorry :)
"You could try running with "WINEDEBUG=-all wine <program>" to check if the fps drop is due to the console spamming."
I did it, but it didn't fix performance issue.
P.S. I'm Nvidia GeForce 8600m 256MB RAM owner with lastest 304.30 driver version. Tried previous drivers up to 290.10 but doesn't change anything.