Um... no. From the article:<p>"I thought I'd demonstrate this functionality, with a bit of real world code. Postabon recommends deals to users based on a variety of factors such as the age of the deal, other people's votes, your preferences, and (relevant for this example) your distance from the deal. Most of the other factors can be computed asyncronously and just cached, but your distance from deals is computed a lot, and can't really be pre-computed since I have no way of knowing your location a priori (well, that's not strictly true, and we do do some memoization, but it has a relatively low hit rate)."