1. Clean out your lint
Lint build up is the #1 thing that prevents effective drying. Keep it clean to dry your clothes fast!
2. Wring out your clothes before you put them in the dryer
No use in drying it in the dryer when you could take a lot of the water out yourself.
3. Put dry towels in with a load
This makes it to where the towels absorb much of the water. Divide and conquer the water!
4. Make your dryer vent hose shorter
This one is a bit more labor intensive, but could help tremendously. The shorter the hose, the more efficient your dryer becomes.