That is one of the things I like about this movie, how they can depict superspeed. I think it looks very good. It is one of the things that bothered me about the Reeves movies. Due to where technology was at the time they really couldn't show superman moving at fast speeds.
I thought they did a pretty good job realizing it, whether it was him spinning down into Lex's lair, or flying around the Earth to reverse time. It didn't show up during the battles, but that didn't bother me, and I can't say I really missed it.
I mean, for me the junkyard battle in SIII wouldn't have been nearly
as cool if Clark and Evil Supes were zipping around each other like cartoon characters the entire time. I think you would have lost a lot of the menace and tension in the scene.