But I don't think that needs to be an issue.It's not a question of visuals, it comes down to real life timing.
A comic book can depict action which takes place in a 1/10th of second using pages of exposition and numerous panels to narrate the action. It's up to the reader to manage his or her own pace in how fast the action "moves."
Unless you want everything on screen to run in slow motion (which is especially awkward looking in traditional animation - which is why it's rarely if ever used) the same technique cannot be applied. The viewer consumes on-screen visuals at a fixed rate of speed.
Super speed on screen needs to be super fast - - unless you like the slo-mo approach used by The Six Million Dollar Man in the 1970's.
The best Flash art is frenetic and constantly in-motion, almost as if it was animated rather then still panels, so having it actually be animated would only be one step forward from that in my opinion.
And unlike in the live-action show, where they would usually need to pad things out to fit an hour-long storyline and the FX budget, that would not be an issue for a cartoon. Everything else would be down to the writing and animators.