Site Speed Chrome Extension - Core Web Vitals

See Core Web Vitals metrics for every website you visit

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Added Jul 2026

chrome.google.com

Speed TestFreespeed-test

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What is Site Speed Chrome Extension?

Site Speed is a Chrome extension that displays Core Web Vitals metrics (TTFB, FCP, LCP, CLS, FID, INP) for websites you visit, helping you quickly understand page performance. It shows observed metrics collected by PageSpeed Insights before throttling simulation is applied, providing accurate performance insights. The extension integrates with DebugBear's monitoring tool for deeper analysis and is built for web developers, performance engineers, and site owners who need real-time performance data.

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Key Features of Site Speed Chrome Extension

View Full TTFB metric
Display First Contentful Paint (FCP)
Show Largest Contentful Paint (LCP)
Monitor Cumulative Layout Shift (CLS)
Track First Input Delay (FID)
Measure Interaction to Next Paint (INP)
Quick navigation to external web performance testing tools
Display observed metrics before PageSpeed Insights throttling simulation
Integration with DebugBear monitoring tool

Who Should Use Site Speed Chrome Extension?

Monitor website performance while browsing

Quickly assess Core Web Vitals for any website

Debug performance issues in real-time

Compare observed vs. simulated metrics

Access external performance testing tools directly

Track user interaction metrics on live pages

Site Speed Chrome Extension: Pros & Cons

✓Pros

Real-time Core Web Vitals display for any website
Shows observed metrics before throttling simulation
Seamless integration with DebugBear platform
Quick access to external web performance tools
4.8/5 rating from users
No data collection or third-party data selling

✕Cons

FID and INP metrics only available after user interaction
Extension currently unavailable on Chrome Web Store (per page notice)

Frequently Asked Questions about Site Speed Chrome Extension

What metrics does Site Speed Chrome Extension display?

The extension shows Full TTFB, First Contentful Paint, Largest Contentful Paint, Cumulative Layout Shift, First Input Delay (after user interaction), and Interaction to Next Paint (after user interaction).

What is the difference between observed metrics and PageSpeed Insights metrics?

The extension displays observed metrics collected before PageSpeed Insights applies throttling simulation, helping you understand real performance before simulated conditions are applied.

Does this extension collect my data?

No, the developer has disclosed that it will not collect or use your data, and your data is not being sold to third parties.

Can I access DebugBear from this extension?

Yes, users logged into DebugBear will see a 'View on DebugBear' link in the extension for deeper monitoring and analysis.