PerfBar: simply collect and view your website performance metrics

PerfBar is a tool by Khalid Lafi that puts dozens of metrics (as well as custom metric support) at the tip of your fingers with just a single script include.

Once set up, PerfBar adds a collapsable bar to the bottom of your website that displays the metrics for the current session. Here's what it looks like in action on the project's homepage:

perfbar

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