Catch Me if AI Can
Claude, Codex, Lovable, and other AI tools can build your site fast, but they’re optimizing for features and functionality, not page speed.
GTmetrix measures the performance that your AI tool never checked, and tells you how to fix it.
Get GTmetrix PRO + MCP CreditsAnimated line chart showing Performance Score declining from 95 to 60 across five rounds of AI-driven iteration, while feature completeness stays flat at 100.
AI Builds Fast. It Doesn’t Always Build Fast-Loading.
AI coding tools are remarkably good at shipping a working website in minutes, and they’re built to deliver the features and design you asked for, not necessarily the most performance-efficient implementation.
As you keep iterating, adding pages, widgets, and polish, that gap between “it works” and “it’s fast” tends to grow rather than shrink.
GTmetrix tests for everything AI left behind, so you can fix it before your visitors feel it.
AI-generated sites tend to repeat the same handful of mistakes.
Unoptimized Media
Images and video shipped at full resolution, uncompressed.
Redundant JavaScript
Duplicate or unused code piles up across revisions.
Huge Script Bundles
Everything loads in one bundle, used or not.
Code Bloat
Layer after layer of generated code, never cleaned up.
Unoptimized Custom Fonts
Web fonts loaded synchronously, in every weight, with no fallback while they load.
No Best Practices by Default
Async/defer and lazy-loading aren’t automatic unless you ask.
Get a Real-World Assessment, Not a Code Review in a Vacuum
GTmetrix tests your AI-Built website in real servers around the world.
- Tests run from 25 real locations across North America, Europe, Asia-Pacific, and beyond
- Real servers and real network paths, not a simulated environment
- See exactly how your site performs for visitors in the regions that matter most to you
World map showing GTmetrix’s 25 global test locations, with a bright, multi-ring pulse that radiates outward from one location at a time, cycling in a randomized order around the globe.
Real Performance Data, In Plain Language
Ask a question, get a real answer, right in the chat.
- Ask in plain language, like "Why is my LCP slow?", and get a real, specific answer
- The same real GTmetrix data your team sees in a full report, no dashboard or export required
- Confirm a fix worked by rerunning the same test in the same conversation
Connect GTmetrix to Any MCP-Compatible AI Tool
The GTmetrix MCP brings real performance data directly into your AI coding chat.
- Works with Claude, Cursor, GitHub Copilot CLI, ChatGPT, Lovable, and any other MCP-compatible tool
- No separate app or dashboard required
- Connect in a few clicks with OAuth, or try it as a guest with no account
Diagram showing GTmetrix MCP connecting to Claude, Codex, Cursor, and Lovable one at a time in turn, with a request pulse traveling to GTmetrix MCP and a result pulse traveling back to the tool, forming a feedback loop.
Real Results
Real teams already take advantage of the GTmetrix MCP.
We audited, optimized, and fixed Lovable websites by connecting the GTmetrix MCP and getting real-time GTmetrix performance data all inside the Lovable chat.
Learn how Sabir transformed performance optimization across 200+ eCommerce brands with the GTmetrix MCP and AI-driven automation.
Frequently Asked Questions
AI tools optimize for shipping features, not necessarily load time.
Issues like uncompressed images, bloated JS bundles, and missing lazy-loading tend to accumulate quietly with every round of iteration - often invisible until you actually test for them.
Common patterns include unoptimized media, redundant or duplicated JavaScript, everything bundled into one large script, accumulated code bloat across revisions, unoptimized custom fonts, and missing best practices like async/defer and lazy loading.
A code review checks what was written; GTmetrix tests how the site actually performs.
Tests run from 25 real global test locations across real servers and real network paths, so you see genuine load performance for visitors in the regions that matter to you, not a simulated estimate.
You can ask a plain-language question like "Why is my LCP slow?" directly in your AI chat.
GTmetrix MCP runs a real test, retrieves the results, and your AI tool explains the cause and proposes a fix. Once applied, it can rerun the test in the same conversation to confirm the improvement, no dashboard or export required.
Any MCP-compatible tool, including Claude, Cursor, GitHub Copilot CLI, ChatGPT, Codex, Lovable, and others. There's no separate app or dashboard needed.
Learn how to set up the GTmetrix MCP with your preferred AI tool.
No - you can connect via OAuth in a few clicks even without an account to give it a try.
We recommend creating an account though for continued usage.