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

# RUM update: lux.js v216

We have released v216 of lux.js. This release contains bug fixes and other improvements:

* Long tasks buffering (which was previously reverted in v214) has been reinstated, enabling RUM to instrument long tasks that occurred before the snippet.
* JavaScript [page labels](https://support.speedcurve.com/docs/rum-page-labels) are now evaluated quicker than before.
* RUM can now use a simpler beacon mechanism with `LUX.beaconMode = "simple"`. This sends a beacon by inserting an image into the page, rather than a `<script>` tag.