It's especially interesting because this same idea is also responsible for saving Rails 3's ass from being far slower than Rails 2. Read through this discussion

It's especially interesting because this same idea is also responsible for saving Rails 3's ass from being far slower than Rails 2. Read through this discussion of how Rails 3 queries were sped up by using an AST decoupled from its final use: http://www.slideshare.net/tenderlove/zomg-why-is-this-code-so-slow http://www.slideshare.net/tenderlove/zomg-why-is-this-code-s....