Earlier this year (march 2007) I went to the PHP Quebec Conference in Montreal where I met Rasmus Lerdorf. He gave a very interesting presentation where he talked about various things, including something called calgrin, xdebug and cachegrind. It seemed very interesting but I did not have the opportunity to try it. Until recently that is, now that my project is in beta in terms of features and that we need to tune it to increase performance. I saw this post and it reminded me of these tools.
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