I have been stressing to my students recently the importance of having a quick, explosive hip-drive. Waiting longer to hinge, and, trying to minimize the time spent between hinge and snap. (Not to be confused with bend and snap, folks). ;)
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During a short snatch practice last night, I realized my hip drive was much slower in snatches than in swings, and worked to speed that up - with great results, of course! Wait longer to hinge, and make it quick! PULL hips back, rather than just letting them hinge naturally. Snap quickly, rather than having a pause at the bottom... and your snatches WILL be more powerful. Moving the same amount of weight the same distance more quickly is an increase in force. And that's a good thing. :)