Speed

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On the web, it's all about speed.

Google has some interesting products as well as good information about speed optimization. See https://developers.google.com/speed/docs/insights/about

See Mozilla's Firefox Developer Tools. or Chrome Dev Tools

Use Apache Bench for local testing and establishing a baseline before tweaking anything on the server.

Not directly related, but there is also https://www.browserling.com/ for testing different browsers.