Re: Hmm..
I'm really not sure at what speed Cyclop's eye beams are supposed to work at, but given that Spidey avoids Electro's lightning bolts all the time, I don't think it's an issue much...
Personally I think it's the pre-cognition Spider Sense thing, that plus his speed probably means he's avoiding where the shot is going to be before his assilant even makes it..