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

# RUM update: lux.js v301

**25 April 2022**

### New features

* The synthetic onload time for SPAs can be marked with `LUX.markLoadTime()`, allowing `LUX.send()` to be called later in the page lifecycle.
* Added the [SpeedCurve RUM Debug Parser](https://speedcurve-metrics.github.io/lux.js/debug-parser.html) to help interpret the debug messages.
* `LUX.getDebug()` now includes events that help to debug some metrics including LCP, CLS, element timing, and long tasks.
* Source maps are now available for lux.js.

### Bug fixes

* Fixed a bug where JavaScript errors were only tracked on the first SPA page view.