The speed thing is like saying that Superman loses his magic and Kryptonite weakness PC. Stat-wise barring weaknesses Supes is top-notch in most areas sans energy projection. He's done more with brute strength more often than just about anyone a person could care to name to abstract concepts or energy than some energy manipulators have.
I know I'm going to get called fanboy on this but taking away superman's weaknesses and stupidly retarded losses makes him the single most powerful "herald" level character I've seen. He's toppled Gods in the skyfather tier and destroyed beings capable of wiping the universe/multiverse. Superman answers the call in comics to combat some of the strongest threats in the multiverse where others fail. He's done this often enough that it can't be called PIS. However I do concede the number of his feats that are far lower than this are more common but he IS the hero DC tends to go to for indomitable foes.
Anyways Thor clears the list mostly on account of Mjolnir more than his own skills and he has to use his less frequently used powers to do it.