Movement speed is so minor, you can barely even notice it. Who reforges accessories to Quick or Violent? Almost everyone hopes for Menacing, Lucky, or Warding, or weaker versions of the three. Cobalt might let you get from one side of the map 5 seconds faster than Palladium, but Palladium will keep you alive far longer, as well as defeat enemies faster. It deals more damage in both raw damage and through crits (more crits as well as stronger crits), takes 2 to 3 less damage, and heals 15 HP every 5 seconds. Palladium is far superior. Maybe if you forgot the healing ability, they'd be about equal, but it heals.