There is a tendency, especially amongst young and/or novice players, to assume that fast = good. After all, if you can play that fast you must be a good player, right? In time, most get past this and start to focus on playing well, although unfortunately there are some who don't.

It's not uncommon to see a young player deliberately get faster and faster until everyone else has dropped out, and then finish with a smug flourish. What he doesn't realise is the the others dropped out not because they couldn't keep up, but because they got bored.