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.
Why You Need to Monitor Your Site for Performance
We walk you through all the reasoning behind monitoring your website with GTmetrix, complete with real-world examples and data.
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 general web performance terms!
