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There's a saying "hardware is cheaper than developers", but this only holds true if you treat your hardware with the respect it deserves.Learn how to diagnose, confirm and fix bottlenecks in your application using new tools like XHProf and tried and true tools like xdebug. Also, we'll take an in-depth look at apc (advanced PHP cache) and memcache; even if you know and use memcache, this one can probably teach you a thing or two.