http://bugs.winehq.org/show_bug.cgi?id=20118
--- Comment #7 from quasi-anonymous user from bugmenot.com winehqbugs@bugmenot.com 2011-04-15 00:11:05 CDT --- I still have this bug, found in 1.2.3 and 1.3.17 -- running Debian stable, an old nvidia card with nonfree drivers. I get a playable ~12-15 fps with my current oblivion settings in 1.1.28, but 1.1.29 and up drop down to ~5 fps, and lowering display quality seems to have little effect.
Also, is there a reason Oblivion is not listed under the affected apps for this bug? (There aren't any listed, in fact.)