Simon Willison’s Weblog

How to find un-indexed queries in MySQL, without using the log (via) Use tcpdump(!) to sniff the MySQL protocol and dump out queries that had the “no index used” bit set. 19th August 2009, 11:42 am

Building a Better JavaScript Profiler with WebKit. Clever hack from Francisco Tolmasky which solves the problem of JavaScript profilers showing ? as the name of any anonymous functions. He patched the WebKit profiler to look for a displayName attribute on a function and show that as the function name instead. 29th April 2009, 11:57 pm

Heap Dump Analysis. Using jmap to dump the JVM’s memory to disk, then analysing it using the visualvm GUI tool. 2nd April 2009, 10:34 am

Using the New MySQL Query Profiler. Extremely powerful new feature in MySQL 5.0.37. Definitely something for the Django debug toolbar. 1st October 2008, 1:20 am

Deep Profiling jQuery Apps. Neat plugin from John Resig that monkey-patches most (all?) of the jQuery methods to build up a detailed profile of which methods are being used by a given page. 16th June 2008, 10:20 am

YSlow: Bug (fix) in Firebug’s Net Panel. The latest release of the YSlow page analysis plugin (announced at FOWA) also fixes a misleading bug in Firebug’s Net panel. 5th October 2007, 10:26 pm