FrothByte
Nailcutter Massacre
If we act like each and everyone in the fight would immediately act to the best of their abilities, then at the start of the bell Superman immediately speed blitzes, Thor immediately puts up a lightning offensive aura/shield, SW puts up a shield, Vision goes intangible. And all of these could be done at the speed of thought.
Superman might be fast enough to attack one of them before they put their defense up but I doubt he's fast enough to blitz all of them. So depending on who Superman attacks first, there's a good chance that one or two heavyweights will be able to put up their defense enough to give Superman a fight.
If Vision is able to turn intangible then it doesn't matter how fast Superman is, he's not going to be able to hit him. If Thor is able to put up his lightning shield which we've seen attack anyone close to him, then it might be hard for Superman to approach him regardless of how fast he is.
And the thing is, most of these guys are tough enough to survive a punch or two from Superman. He isn't knocking them out with one blow, not even IM. SW obviously gets splattered if she doesn't get her shields up. My point is even if Superman blitzes them, they'll still be able to put up defenses after the first hit or so.