First world problems. I don't think it's slow at all on my iPhone 5. It takes less than a second for each animation. I don't get why people think that extra fraction of a second is going to make a real difference. All of the transition animations in your day probably add up to 10 extra seconds.
I timed 5.7 seconds for me to come out of one app and enter another one (via two separate folders). The same actions can be performed in half the time on iOS6.
Some people like the pretty animations that slow down their productivity, others like myself prefer to be able to swap quickly and effortlessly between folders and applications. After all, what's the point of giving a speed bump to the latest iPhone when it's restricted by the iOS animation speeds.