http://bugs.winehq.org/show_bug.cgi?id=34041
--- Comment #7 from Ken Thomases ken@codeweavers.com 2013-09-15 17:42:44 CDT --- There's no obvious sign that anything's wrong. It doesn't seem like it's stuck nor looping in a tight loop. It looks like it's actually doing some work.
How long have you waited? Steam may be doing some network communications, like syncing cloud data. It can sometimes be quite slow at that.