The way of the
Plus, he's got an awesome philosophy on programming to boot (yes, there is a programming philosophy! ... no comprende? Let me explain later).
All in all, it was really cool to meet someone that's completely congruent with what he says & lives out as a programmer. It almost felt Bret Victor-like.
Profile before optimizing
If you have an existing codebase, don't get carried away with premature optimizations. Profile to find the slow bits and pick the low hanging fruit.
Some of the latter lessons in Code School's Chrome DevTools course will teach you how to profile your code.