I've recently been trying to do the snap change, I've been practicing this for a while now, my technique is fine it's just I cannot seem to do it as quick as it's meant to be, any suggestions on what I might be doing wrong?
What i found when i first started doing this change, is that my grip was too tight, and that was causing it to slow down and not be as fluid as it should be. Basically make your grip as light as you can whilst not dropping the cards.
Yeah! just keep practicing in the mirror for a while, until you fool yourself with the colour change. Also try griping the cards from different edges, in the classic grip but also on the long side of the cards. (like in for example "fission of aces")