http://bugs.winehq.org/show_bug.cgi?id=21994
--- Comment #20 from NSLW lukasz.wojnilowicz@gmail.com 2010-03-11 10:02:53 --- I don't think it's duplicate. Please see comment #4 from bug #11674. Here the usage of one core isn't inversely proportional to the usage of the other. Here one core is used to the maximum and the second stays idle at all time.