Update of TTFB Measurement in Synthetic Data (release 4.7.1)

Today, we have implemented a change in measurement that will affect server response values (TTFB metric) in synthetic data.

The TTFB metric consists of several parts. To simplify, the main ones are:

1. Redirect
2. DNS Lookup
3. Connecting and TLS
4. Waiting for the server's response

Previously, our values included everything except the last one (Waiting for the server's response).

Going forward, our reports will display the sum of all these values. From May 5th, TTFB values may be higher than before.

To avoid overwhelming you with Watcher notifications of limit breaches caused by our change, we won't report TTFB changes on this day. Additionally, we've added a note in the app interface in PLUS tests stating:

[AUTO] Change in TTFB measurement

In the Page Report, you'll find all metrics for each of your site's measured page types.

While we're at it — release 4.7.1 includes a number of other enhancements, such as:

• Pages/CrUX Report: we've added distribution graphs for each page.
• If you're using HTTP basic auth, we now notify you that TTFB metric values will be affected.
• Synthetic: instead of an exclamation mark in the modal, we'll display real metric values (if available).
• Bug fix: Watcher displays a negative number of days.
• Bug fix: The "Go to pages" link in the Watcher modal does not work correctly.

We continue to refine our measurements and introduce new features to help you achieve faster websites.