RUM update: lux.js v307

3 April 2023 (UTC)

New features

  • Session windows have been implemented for the CLS metric. This may reduce CLS scores on long-lived pages.

Bug fixes

  • INP is now reset when LUX.init() is called.
  • Fixed a bug where INP could be recorded twice for a single page view.
  • Ignore first-input entries for INP when there is a matching event entry.


  • The code that determines the page label based on Page Label URL Rules has been optimized, reducing the size of lux.js.