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Troubleshooting FAQs for LUX and Synthetic

Troubleshooting FAQs for LUX and Synthetic

Run into problems with your synthetic tests or real user monitoring? Find answers to common issues here.
Tammy Everts avatar
Written by Tammy Everts
Updated over a week ago

"One of the basic rules of the universe is that nothing is perfect.
Perfection simply doesn't exist…
without imperfection, neither you nor I would exist."

Stephen Hawking

Synthetic testing

  • Why have my synthetic tests failed or produced unexpected results?
  • Advanced debugging: Viewing detailed test results
  • Debugging your WebPageTest scripts
  • Troubleshooting Lighthouse
  • Why is my deploy stuck?
  • A/B tests interfering with metrics and alerts
  • Seeing OCSP requests in your waterfall charts
  • Filter SpeedCurve test agents / whitelist IP address
  • Filter SpeedCurve traffic from Google analytics
  • Why are my SpeedCurve results different from my other test results?
  • Why does my page load / fully loaded time fluctuate so much?
  • Remove outlier test results from your charts
  • Why don't my charts change when I select median, average, and 75th/95th percentile?

LUX real user monitoring

  • Is the LUX snippet working correctly?
  • Why you shouldn't use a tag manager to deploy the LUX snippet
  • Why are my LUX metrics different from those reported by CrUX?
  • Why are my Synthetic and LUX numbers different?
  • LUX query timeouts

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