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Profiling PHP with XHProf & XHGui
Dec 18th, 2015 by pixel

For a well described tutorial on basic PHP profiling and optimization I would recommend the 3 part article written by Davey Shafik:

Profiling PHP Part 1: Intro to Xhprof & Xhgui

Profiling PHP Part 2: Xhgui In-Depth

Profiling PHP Part 3: Practical Performance Tuning

Installing Node.js and NPM on Mac OSX
Aug 24th, 2015 by pixel

The Node.js site has finally started building packages for node.js instead of requiring users to install using source. The download page can be found on the page for Node.js Downloads.