If the player is moving REALLY slow, this could be a bug with your browser, try shift+refresh or a different browser (or even the exe version). If you're just moving kind of slow, then you'll want to craft speed potions - check out the right side of the island for the Alchemist.
 "Aground"){kind=icon}
 "Utopian Mining"){kind=icon}
 "Gravitee Wars"){kind=icon}
 "Protector IV"){kind=icon}
 "Battalion: Ghosts"){kind=icon}
 "Achilles"){kind=icon}
If the player is moving REALLY slow, this could be a bug with your browser, try shift+refresh or a different browser (or even the exe version). If you're just moving kind of slow, then you'll want to craft speed potions - check out the right side of the island for the Alchemist.