It seems to me like worrying about web download speed is something that goes in and out of fashion. It will be all the rage for a while as some new technology comes in to make it possible to shave off some miliseconds or some other disruptor makes people think slow is bad. But then it gets tedious for all but the most die-hard speed demons and most designers seem to stop worrying about it until it comes back into fashion again. Do you worry about how fast your pages download? Why or why not?