Quick swing or not ... you still need to complete the backswing and make a good transition to get the club working correctly in the forward swing.

The transition should feel like your left hip is starting a slight move to the target before getting out the way by turning left. At the same time, the grip of the club should be starting down and it is possible that the club head travels towards the target for a fraction of a second longer.

Here's a drill to get the feeling:
Take a backswing and as you get to the top, start to move your left hip back to the left and at the same time overswing a fraction (your hands and the club carry on going through the backswing) and then let your hands pull the grip down towards your right hip. It exaggerates the opposite movements of the club and left hip ...

That is what a transition should feel like.

To stop your large muscles (back and shoulders) from jumping the gun, try this drill:
When you get to the stop of the backswing stop moving your shoulders and back. Start by moving your left hip forward to the target laterally and then left and at the same time let your arms pull the grip of the club down towards your right hip. Keep your back and shoulders as still as possible for as long as possible (it will probably only be a fraction of a second) until you get the feeling that you've dropped the club into an inside path and then let your large muscles move.

Hope this helps. Post again of you need more help.

__________________
Golf is easy ... once you know how.
Graham Arnott, teaching professional
Kelrosa Golf Studios
www.kelrosagolf.com
Class 'A' PGA Member
Full Member: World Golf Teachers Federation (GB&I)