Fast computers
The difference between Jill's early iBook and the shiny new Tinderbook: her big Tinderbox file loads 37 seconds on her computer, and in 15 seconds on mine. It's a small difference, but it can matters.
The big surprise here is that Tinderbox can load big files as quickly as it does. That doesn't keep people from wishing it were even faster. Remember when Victory Garden took five minutes to start up?