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Understanding Metrics
Understanding Metrics
How to interpret each metric.
+2
17 articles in this collection
Written by
Mark Zeman,
Steve Souders,
Tammy Everts
and 2 others
Diagnose Cumulative Layout Shift (CLS)
How to quickly identify what's causing the biggest layout shifts on your pages
Written by
Tammy Everts
Updated over a week ago
Why are my LUX metrics different from those reported by CrUX?
Understanding why your LUX numbers may not match up with the Chrome User Experience Report (CrUX) and what to do about it.
Written by
Cliff Crocker
Updated over a week ago
When should I use average, median, and other percentiles?
How to choose between average, median, 75th percentile, and 95th percentile
Written by
Joseph Wynn
Updated over a week ago
What do the different SpeedCurve metrics represent?
Glossary of metrics you can track with Synthetic and LUX Real User Monitoring.
Written by
Steve Souders
Updated over a week ago
Why are my Lighthouse scores different from my other test results?
Here's why your Lighthouse scores in SpeedCurve might be different from the scores you get elsewhere.
Written by
Tammy Everts
Updated over a week ago
Why are my Synthetic and LUX numbers different?
It's quite typical for RUM metrics to be faster than Synthetic. Here's why that is – and why you still need both types of monitoring.
Written by
Tammy Everts
Updated over a week ago
Why are the SpeedCurve results different from my other test results?
Here's why. But remember: the most important thing to track is consistency and changes within a single testing tool and settings.
Written by
Mark Zeman
Updated over a week ago
Why does my fully loaded time fluctuate so much?
Some pages may have very high or fluctuating fully loaded times. Here's why.
Written by
Joseph Wynn
Updated over a week ago
Lighthouse scores and audits
How to find and track your Lighthouse scores and audits.
Written by
Tammy Everts
Updated over a week ago
How to remove a single data point from your test averages
If outlier test results are bumping out your averages, here's how to exclude them.
Written by
Tammy Everts
Updated over a week ago
Hero rendering times
How we identify the hero rendering metrics, plus how to add element timing.
Written by
Mark Zeman
Updated over a week ago
How is Speed Index calculated?
What is the Speed Index score and why does it sometimes not align with your other metrics?
Written by
Tammy Everts
Updated over a week ago
Blocking JS & CSS
How SpeedCurve detects blocking JavaScript and stylesheets
Written by
Steve Souders
Updated over a week ago
Why don't my charts change when I select median, average, and 75th/95th percentile?
Written by
Joseph Wynn
Updated over a week ago
LUX Query Timeouts
How to avoid having LUX queries time out.
Written by
Steve Souders
Updated over a week ago
Data Protection & GDPR Compliance at SpeedCurve
Written by
Mark Zeman
Updated over a week ago
Time Labels in Charts
What exactly do the time labels in the charts mean?
Written by
Steve Souders
Updated over a week ago