This is part of the #285 meta.
Description of the need
Respective d.org issue: https://www.drupal.org/project/drupal/issues/3104566
Providing server timing would help developers estimate site performance. The corresponding W3C specification is currently in "Working Draft" status and its already supported by Google Chrome and Firefox.
https://www.w3.org/TR/server-timing/
This specification enables a server to communicate performance metrics about the request-response cycle to the user agent. It also standardizes a JavaScript interface to enable applications to collect, process, and act on these metrics to optimize application delivery.
Symfony adopted it in https://github.com/symfony/symfony/pull/27985
Proposed solution
Add
Server-Timingheader with relevant timing information.
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