Since his exposure to Isotope E, they have not been able to accuratly guage Quicksilver's speed. He can surpass the speed barrier at least, and probably a bit more. He also seems to have other powers, glimpsed at only briefly in his own series. At the urging of a mysterious benefactor, he concentrated upon shackles that bound him, and they somehow burst. Whether these are small scale latent magnetic powers from his father, or perhaps the willing and speeding up of molecules other than his own, there is no way of telling. I wish they had let his series continue, I for one thoroughly enjoyed it at my own amazement. He had always seemed a rather bland character, defined only by his brash actions. This helped to spread more light on him.