Originally Posted by death on a stick
Unfortunately most DJs have no concept of how important the warm-up slot is. They often view it is a poor slot, but in fact it's an integral part of the night that they should take responsibility for. Too many DJs get over zealous about things and can't help playing what they think are all their dancefloor devastators in an attempt to make a bigger impression within what they view as a limited slot. It's a very immature way to play and can hamstring a night from the offset.
What needs to be considered is what you are warming up to. For example, if the next DJ is going to be playing fast hard stuff, maybe aim to end your set with that sort of material, but why not actually WARM UP to it, rather than starting at 10pm with a pummelling noise? It gives you the chance to explore how your other records sound, can allow you to relax as the need to play a new record every few seconds isn't there. Also, if the next DJ isn't going to be really hard, try to add to that yourself. Also, most importantly, you can help the night to have some progression rather than keeping it on one level all night, leaving the party people feeling as if something interesting has actually happened.
One problem with all this is that many DJs are just too narrow minded to see that there is quality music beyond fast banging techno. Why not play ambient or slow spacey stuff for the first half hour and build it up from there, for example? It's not as if the doors open and everyone rushes in and wants to start pogo-ing immediately...give them some time to settle in, get a drink, rendezvous with their friends, find their spot on the floor. Then do something. Don't feel that you are being restricted because you can't play exactly what you want, turn it around and play exactly what you want in the context of your time slot. Take the time and make it your own - there's no need for compromise as long as your priority is quality and not just BANGING.