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
Detail
| Operated By | GTmetrix |
| Last Updated | 1 day ago |
Insights
Top Website Robots.txts
Country of Origin
Global Traffic
The percentage of all internet traffic coming from Developer Helpers
Top Visited Website Categories
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?
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 |
# In your robots.txt ...
User-agent: GTmetrix # https://darkvisitors.com/agents/gtmetrix
Disallow: /
⚠️ Manual Robots.txt Editing Is Not Scalable
New agents are created every day. We recommend setting up Dark Visitors Automatic Robots.txt if you want to block all agents of this type.