So, I feel like Mario should have infinite speed.
The mario universe is infinite in size and Mario has several universe crossing feats. Not to mention,
Mario scales to Bowser threatening to destroy the Dream Depot universe by universe, which, as the scan showed, is filled with infinite universes.
Addintionally, Mario c
an move within the dimensional rift between each Secret Level. These aren't pre-destined rifts, either, as Shadow Mario left and never appeared in the Secret Level with Mario. With that said, this must have been a white, empty rift that Mario and Shadow Mario moved through on their own. The background moving was only because the two Marios were moving, evidenced by their blurs, so this was indeed an empty rift. Also, in Tick Tock Clock, the progression of time is
dependent on when you enter the world. Entering at 12 o'clock
stops time completely, yet Mario can still move freely in this state
Also, Mario fought and easily kept up with Culex, and Culex is the Master of Time and Space, and can consume time. Thus, timeless voids would be his natural environment. He also holds time from its beginning to its end, and during his fight, he was crossing between dimensions.
It's actually stated in the Japanese version he was within a dimensional rift, and those are, by definition, devoid of time and space. Furthermore, he was about to leave Mario's and go back to Vanda--thus, he was in between dimensions at the time. Meaning, he was outside of the space-time continuum--which all qualifies for
infinite speed.
Mario also had his speed complimented by the Zeekeeper, and can also keep up with him and Giant Dreamy Luigi, as well as characters equal to or faster than Zeekeeper. Zeekeeper can
tear a dimensional rift. Rifts are, again, by definition, absent of time and space.
Any contentions?