GTmetrix

What is GTmetrix?

About

GTmetrix is a website performance analysis bot that crawls and analyzes web pages to measure speed performance. Using PageSpeed and Lighthouse, GTmetrix generates performance scores and provides actionable recommendations to optimize website loading times. You can see how often GTmetrix visits your website by setting up Dark Visitors agent analytics.

Expected Behavior

Developer helpers generally visit websites on direct behalf of a user who is evaluating some feature or attribute. Visits can be one-off or part of a larger crawl.

Type

Developer Helper
Used by developers to test website functionality

Detail

Operated By GTmetrix
Last Updated 3 hours ago

Insights

Top Website Robots.txts

0%
0% of top websites are blocking GTmetrix
Learn How →

Country of Origin

United States
GTmetrix normally visits from the United States

Global Traffic

See All Global Bot & LLM Insights →

The percentage of all internet traffic coming from Developer Helpers

Top Visited Website Categories

Business and Industrial
Home and Garden
Finance
Computers and Electronics
Arts and Entertainment
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Robots.txt

Should I Block GTmetrix?

Probably not. Developer helpers are normally used to optimize or find problems with your website.

How Do I Block GTmetrix?

⚠️ Manual Robots.txt Edits Are Not Scalable
New agents are created every day. Instead, serve a continuously updating robots.txt that blocks new agents automatically.
Set Up Automatic Robots.txt

You can block GTmetrix or limit its access by setting user agent token rules in your website's robots.txt. Set up Dark Visitors agent analytics to check whether it's actually following them.

User Agent String Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 GTmetrix 
# robots.txt
# This should block GTmetrix

User-agent: GTmetrix
Disallow: /

References