Please tell me that you're not arguing choreography or the "moving faster than the eye can see!" ramblings. I believe Nai brought up an article relating to this on EoD, and according to the Holocron, the discrepencies between the speeds depicted in the EU and the movies don't apply, and the only reason "faster-than-the-eye-can-see" moves haven't been shown is that for cinematic purposes, it wouldn't be plausible for a fight scene to be depicted.
The argument that "Yoda and Sidious" can't move faster than the eye can see is ridiculous considering that out-of-universe demands and requirements force such things not to be shown.
And as far as Mace vs. Sidious, Lucas said in the commentary that "he wanted to be right up in their faces". A very personal fight. I think he also commented on the intentional slowness of the duel, which is accentuated by the very fact that Jackson (and especially) McDiarmid are not trained swordsmen or stuntmen, and both are well beyond their physical prime (again, especially McDiarmid).
We also see Sidious move at ungodly speeds during his fight with Yoda thanks to the CGI variant and the stuntman, as Lucas wanted the duel to be "on a grand scale".