Focus and shield gives Swiftness. There is a chronomancer well, inspiration trait, and elite skill that gives super-speed. Chronomancer has a passive speed boost as a minor trait. Mirage can take sword and leap with every dodge (I have a set just for this, super useful.) Staff has a very low cd blink. Blink (the utility) is one of the lowest cooldown, longest range ports in the game. Finally, portal is crazy mobility for your entire team that is currently being abused in the new CM.
In what world do you live that MESMER is not mobile?