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Tools for analyzing site performance fall into 2 types: **online services** and **devtools / CI integrations**. Here are the main ones:

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### **Browser tools**

- **Chrome DevTools → Performance tab**
Records and visualizes page behavior (timelines, blocking, layout, paint, GC, and so on)
- **Chrome DevTools → Lighthouse**
Scores the site on metrics (LCP, FID, CLS, TBT, and others) and gives recommendations.
- **Web Vitals Extension**
Shows real metrics (LCP, CLS, FID) in real time right in the browser.

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### **Online services**

- **PageSpeed Insights**
From Google. Analyzes both real user data (CrUX) and simulated performance.
- **WebPageTest**
Gives a very detailed picture: waterfall, filmstrip, thread blocking, TTI, visual progress, and so on.
- **GTmetrix**
A more visual interface for analyzing loading speed and recommendations.

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### **Automation and CI tools**

- **Lighthouse CI**
Automated site audit in CI/CD. Lets you set a performance budget and fail the build on violations.
- **Web Vitals Reporters**
Connect to real traffic (via JS) and send metrics (LCP, FID, CLS) to analytics (for example, GA, BigQuery).
- [**Sitespeed.io**](http://Sitespeed.io)
An open source tool for integrating Lighthouse, WebPageTest, and analyzing large volumes of pages.

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### **Third-party profilers / add-ons**

- **Perfume.js**
A JS library for collecting web vitals directly in users' browsers.
- **Calibre**, **SpeedCurve**, **Treo**
Paid tools for monitoring performance over time, with version comparison, alerts, and real-time metrics.

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**Conclusion:**
If you are testing locally → DevTools + Lighthouse.
If you are checking production → PageSpeed Insights + Web Vitals.
If you are automating → Lighthouse CI + Web Vitals Reporter.

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