Free Performance Tool

Cloud processed

Core Web Vitals Auditor

Measure your website's Core Web Vitals and performance metrics with Lighthouse. Get detailed analysis of LCP, CLS, TBT, and more with actionable AI-powered recommendations.

Enter a URL to analyze. The audit typically takes 30-90 seconds.

Free to use · 50 audits per day. Sign in for higher limits or add credits for unlimited access.

What Are Core Web Vitals?

LCP - Largest Contentful Paint

Measures how long it takes for the largest content element to load. Target: under 2.5 seconds.

CLS - Cumulative Layout Shift

Measures visual stability - how much the page layout shifts unexpectedly. Target: under 0.1.

TBT - Total Blocking Time

Measures how long the main thread is blocked. Target: under 200ms for good interactivity.

INP - Interaction to Next Paint

Measures responsiveness to user interactions. Target: under 200ms for a responsive experience.

Understanding Your Performance Score

Score Grade Description
90-100 A+/A Excellent performance - optimized for users and search engines
70-89 B Good performance with room for improvement
50-69 C Needs improvement - users may experience slow loading
30-49 D Poor performance - significant optimizations needed
0-29 F Critical issues - immediate action required

Note: Performance scores are based on Google Lighthouse and can vary between runs due to network conditions and server response times.

cta-image

Build Scalable, Resilient Cloud Infrastructure

Modern cloud-native architecture using microservices, containers, and Kubernetes. We design multi-cloud and hybrid strategies with serverless efficiency, self-healing systems, and automatic failover across zones.

Architect Your Cloud