The quickest kicks come from the pose. Don't pose when you are defending. Move around your opponent. Charge in after you have made him uncomfortable.
Treat a kick the same as someone swinging a sword or club at you, evade or charge in quickly at the right time.
When the opponent fakes, treat it seriously and answer it with a serious technique.
Don't rely on just one technique. If one technique does not work, try another.
The Wing Chun Kung Fu Digital Library