The burst frequency may be a better indicator of playing speed than the top speed. For example, here's Mcmichael vs Lapierre:
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While lapierre has a lower top speed, he does have more 20-22 mph speed bursts per game at 147/51 = 2.88 versus mcmichael's 180/80 = 2.25. There's a good reason lapierre stands out as faster to some people - he uses his speed more often even though he has less of it.
Another example of top speed being misleading is kuznetsov. His top speed this year was higher than mchmichael's, but his 20-22 mph burst frequency was only 95/63 = 1.5/game. That's why he looked so slow all year - he didn't skate fast in games despite being a fast skater.
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Top speed shows which players CAN skate fast, but the speed burst count shows the players who DO skate fast.