Change record status: 
Project: 
Introduced in branch: 
8.9.x
Introduced in version: 
8.9.0
Description: 

We now send the Server-Timing HTTP header with information about page execution time.

The server timing can be obtained in the following ways.

  1. Chrome DevTools
    DevTools
  2. JavaScript
    console.table(performance.getEntriesByType('navigation')[0].serverTiming);
  3. Command Line
    curl -sI https://example.com | grep Server-Timing
Impacts: 
Site builders, administrators, editors