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In a warm up, if you pick the right point you can shift it up 1-2% in a couple of bars and it can throw in a bit of energy in an instant... best point is usually at the end of a build up (so it drops in faster than it was).
If you're really clever, you might have a transition in which you fade/filter out the preceding track during a build up in the one coming in, then you do your tempo shift in the couple of beats just before the incoming track drops, so with any luck you get a nice key change AND a boost in tempo at the same time (you'll have got rid of the previous track just before this, so no trainwreckage)
You can do that at any point in a night of course, but it's one of a number of warm up tricks you can use to persuade the people scuttling round the edge of the dancefloor that things are kicking off and they should move in.
Obviously don't overdo it, you don't want to be going too fast in a warm up so it usually works best if e.g. you started sub-125 and the next DJ's expecting to take over at around 127. Although there's nothing to stop you doing that then gradually pulling the speed back a little bit over the course of the next few tracks so it's not too fast for the next DJ...
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Stu Cox |   
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