Measuring Performance With Server Timing

smashingmagazine.com

For those of you that have looked at performance testing you will be aware of the TTFB, or Time To First Byte. While that's important to know how quick the browser gets anything at all from your server, it doesn't tell us what on the server is affecting that number.

There’s very little browser optimisations can do to improve a page that is simply slow to build on the server. That cost is incurred between the browser making the request for the file and receiving the response.

— Drew McLellan
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