The web is full of advice focussed 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 optimise the optimisation
of your PHP applications.

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Awesome talk, excited to try all the tools.

Good inside on how to tune up PHP code. Good suggestions on tools. Looking forward to attend your Xdebug talk

Excellent talk. Great information and I really enjoyed the direct, honest opinions shared. Fantastic...If possible, I'd love to see the slides posted.

Great/complete overview on that subject