GTmetrix Performance Blog
News, updates and guides on GTmetrix and general web performance
Category: Optimization Explained
Get a better understanding of common web performance concepts.
Everything you need to know about the new GTmetrix Report (powered by Lighthouse)
We’re excited to present a detailed look at the new GTmetrix Report – powered by Lighthouse!
Why is my GTmetrix Performance Score different from PageSpeed Insights, WebPageTest, and web.dev?
We explain why your GTmetrix Performance Score may be different from other Lighthouse-based tools.
Why is my Performance Score always changing?
Is your GTmetrix Performance Score always changing? Discover why in this article.
I was scoring well with the Legacy GTmetrix before but now my grades have dropped. Why?
Learn why your grades may have dropped on the new GTmetrix Report even though you were scoring well on the Legacy Reports.
Glossary of Web Performance Terms
Familiarize yourself with web performance and GTmetrix terms!
