https://bugs.winehq.org/show_bug.cgi?id=35418
--- Comment #18 from Alexandre Julliard julliard@winehq.org --- It's hard to draw any conclusions from the total score, because as you noted, with client-side rendering output is not constantly flushed to the screen, and with X11 rendering drawing is asynchronous and the benchmark can't measure it properly.
That said, back when working on the DIB engine I did spend a lot of time with 2DBench to make sure that performance was adequate, and I believe it is for all common operations. As explained above, the problem with this bug is not the drawing performance, it's the timing of the buffer flushes.