Fast Aces and Kings are primary honors, also known as 'fast' winners.
Not-So-Fast Queens and Jacks are secondary honors that may or may not win tricks after the Aces and Kings are gone, so they are 'slow' winners. Declarer and defenders both try to get their tricks before the opponent gets theirs: so timing in bridge is, as in most things in life, everything.
You Gotta Get Your Tricks At duplicate this is more important than at rubber bridge, as you can get a bottom board if you don't get your tricks, regardless of whether you set the contract or not. You have a better chance to get your tricks if they are fast rather than slow. On the other hand, slow losers are better than fast ones if you are declaring the hand.
This is an important factor in hand reevaluation:
Are my winners fast or slow?
Are my losers fast or slow?
Your opponents' Aces and Kings are sure losers for you -- their Queens and Jacks may not be.
Magic Cards. On the other hand, Queens and Jacks in support of partner's suits are 'magic' cards, worth far more than their point card value: they solidify the trump suit, provide transportation to dummy, etc. A Qx in partners suit is usually worth as much as an outside Ace.
Following is a 7 HCP hand. How many tricks might it take as declarer? As dummy?
ª Qxx
© Jxxx
¨ QJx
§ JxxActually, this hand is a good 7 point dummy, as it is difficult to lead through or toward. It's a poor defensive hand, not because it is weak, but because the winners are all slow.