Flash, easily.
Originally posted by the ninjak
I remember Sonic in the cartoon series moving so fast he created multiple versions of himself in the tens.They simultaneously attacked Robotnik's super mech at the same time.
Timetravel speeds X 10.
There was one comic where Wally West served on two different teams at once, in completely different locations (I think different countries). By which I don't mean, 'he swapped duty back and forth between them,' I mean 'he physically acted like he was in two places at the same time despite being hundreds of miles apart'. When a mage opened a portal between the two places, he saw himself.
Oh, and he changed costumes between locations.