http://bugs.winehq.org/show_bug.cgi?id=27650
--- Comment #16 from Thomas Spear Speeddymon@gmail.com 2011-11-29 23:30:45 CST --- I was pointed to a workaround on a separate bug that I'd like to request some of you try.
Rather than running the Launcher to update WoW, run the BackgroundDownloader.exe in the WoW directory, and as soon as it opens, go into the preferences for that app, disable Peer to Peer downloading, and enable "Don't throttle background download". Then exit the background downloader, run the launcher and see if you still get the same issue.