The web is full of advice focused on improving performance. Before you can optimise however, you need to find out if your code is actually slow; then you need to understand the code; and then you need to find out what you can optimise.
This talk introduces various tools and concepts to find issues with your applications, and tools and concepts that help you optimise the your PHP applications.
PHP internals person, author of Xdebug; OpenStreetMap and mapping enthusiast. Works as PHP Engineer/Evangelist for MongoDB at 10gen. bio from Twitter
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