I guess this need for speed came mostly from the Brits. Think of the driven hunts, which are, or at least were, contests in who killed more birds - and the game was about speed. Actually, I think that three ejector sbs's with two loaders is the limit of human ability in terms of rate of fire on live birds. In most other places now there's a thing called LIMIT. There's only so many birds you can take, often as few as 2 or 3. When you have so few opportunities, you tend to want to prolong the process, to increase the pleasure. Accordingly, you want to decrease the speed, rather than increase it.