Google Outlines Their Plan To Improve The CLS Metric To Be More Fair To Long-Lived Pages

The Chrome Speed Metrics Team recently outlined our initial research into options for making the CLS metric more fair to pages that are open for a long time. Based on the feedback and after completing the large-scale analysis, they have finalized the change they plan to make to the CLS metric:

• maximum session window with 1 second gap
• capped at 5 seconds.

Google claims that since this update caps the CLS of a page, no page will have a worse score as a result of this change.

Google CWV tools will be updated to use the new metric definition soon.