---
agentTools:
  projectIndex: https://support.speedcurve.com/llms.txt
---

# RUM update: lux.js v4.1.0

We have released version 4.1 of lux.js today which brings Long Animation Frame support to SpeedCurve RUM.

### New features

* Long Animation Frame (LoAF) data is now collected, including script attribution for INP.

### Improvements

* LCP, CLS, and INP are now calculated right before the beacon is sent rather than when events are received.