Using GTmetrix
Spotlights on GTmetrix features and how to get the most out of them.
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How to Add Global Notes
Need to bulk add notes to History Graphs on multiple GTmetrix Reports? Now, you can with Global Notes!
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Set Default Analysis Options for GTmetrix Tests
Do you frequently test with a specific set of Analysis Options? Set your own Default Analysis Options in User Settings.
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Adding Custom CDN Hostnames
Last Updated: April 13, 2026 If you’re sure your website uses a performant and reputable CDN, you can add the hostname to GTmetrix tests to avoid triggering the “Use a CDN” audit.
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Using the GTmetrix Waterfall Chart
We’ll show you all the features of the GTmetrix Waterfall Chart in this guide.
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Investigating Lighthouse Report Generation Errors
The methods described below are fairly technical and require some understanding of browser execution and Chrome DevTools.
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GTmetrix Lighthouse Errors
Error generating a Lighthouse report? Learn about different Lighthouse errors and why they happened.
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How to Determine Alert Conditions
We show you how to make the best use of GTmetrix Alerts to stay on top of your webpage’s performance!
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Which location should I test from?
We explain why location matters when testing your page.
