I would agree that having a fast processing speed is a good thing. I've always been very fast at whatever task was there- it took me years though to learn to slow down, read the question carefully; if you finish early, go back and check your answers again.
I'm gettig my kids to learn typing on Nessy Fingers (recommended on this chatsite!)- they had me do it and I can type 80 words per minute. I can write fast, etc.
It is super useful for getting home from work on time too.