“groovy mother...”

Really in-depth front-end web performance tool. Like the “Net” tab of Firebug, but more so. Windows and IE (!) only.

Framework for tracking web performance on end-user machines, from Steve Souders, author of “High Performance Web Sites”.

Proxy for transparent(-ish) sharding of MySQL databases.

The latencies of the modern computer laid bare. “Waiting for a hard drive seek is like leaving the building to roam the earth for one year and three months.”

Cal Henderson on “Why I Hate Django”. At last, someone willing to stand up and publicly state the “All serious programming language inventors have BEARDS!” theory. (Some seriously useful performance thoughts mixed in amongst the bile and kittens)