http://bugs.winehq.org/show_bug.cgi?id=14474
--- Comment #2 from Sergio sergio.jorde@gmail.com 2008-07-14 09:33:46 --- Yes, you right, it only happens in gentoo, but not in xubuntu (same machine, different hd), but I didn't mentioned it because according with other comments, it happens in more than one distribution. But just for the record, I should say it.
I can confirm almost without any doubt that it is not a bug related with any wm. In gentoo, in order to gain some fps I launch the game in a different X session using this script:
#!/bin/bash export GW_PATH = ~/".wine/drive_c/Archivos de programa/Guild Wars/" X :3 -ac -terminate & cd "${GW_PATH}" sleep 2 DISPLAY=:3 wine Gw.exe
No windows manager. If I launch it in KDE it happens too. And of course, no compiz or something with composite.