http://bugs.winehq.org/show_bug.cgi?id=12933
--- Comment #15 from lukian@gmail.com 2010-05-01 12:18:06 --- Steam still uses up to 100% CPU while in use, but it 'calms down' quicker than the previous release. It's still quite sluggish (especially the rendering of the windows); however, the "Update News" window is considerably easier to use/close now.