User blog comment:Baneares/Any thing and every thing/@comment-4454131-20120602191831/@comment-252417-20120602222130

Although Wally's still got the suit (not necessarily the exact same), he's been out the business for a while, so it's understand that he may not be at his top speed, but he did pick up by the end. Also, Impulse was presumably born a Speedster, so he's had time to develop his powers since birth (or at least by since could walk).