Evaluate code performance and analyze the call stack.
Have you ever had a slow page load but you weren't sure what was causing it?
xhprof is a profiling tool that can track the run time, cpu load, and memory usage as your code runs and help you find the bottlenecks.
xhprof is a PHP extension created by Facebook and released as open source.
There are similar tools and paid services, but this is a free option.
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