This specification introduces Server Timing, which enables the server to communicate performance metrics about the request-response cycle to the user agent, and a JavaScript interface to enable applications to collect, process, and act on these metrics to optimize application delivery.

• Read latest draft: https://w3c.github.io/server-timing/
• Discuss on public-webperf

Questions, suggestions? Please open an issue or send a pull request!

See also Web performance README