WebPerformance Report

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#WebPerf result for:

URL: https://www.w3.org/

From: Frankfurt, Germany - (Chrome) - Mobile

Date: 2025-04-18T14:55:54

ID: 250418_AiDcMZ_5XZ

Filmstrip - Video - Map - Opportunities - History - Frustration index (new)

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Optimization Scores

Grades for the most critical performance optimizations.

90 C D A
Lighthouse Perf (new)
Security score
First Byte Time
Keep-alive Enabled
A A F ✓
Compress Transfer
Compress Images
Cache static content
Effective use of CDN
View Performance Optimization Overview

Perf Links

Great posts about web tech.

⚡️ Performance improvements with Edge 134 [windows]

⚡️ Advanced React in the Wild [largeapps]

⚡️ WordPress 6.8 performance improvements [wordpress]

⚡️ Performance Hero: Alex Russell [speedcurve]

Core Web Vitals

UX Metrics for loading, visual stability, and interactivity.

LCP
CLS
TBT
2.469s 0.005 0.242s
LCP - CrUX
CLS - CrUX
INP - CrUX
TTFB - CrUX (new)
1.220s 0.020 0.110s 0.432s
View Web Vitals Diagnostic

Lighthouse Scores

Diagnose performance issues - 3G Fast connection.

Performance
Accessibility
Best Practices
SEO
90 100 100 100
View Lighthouse Report

Performance Results

High-level metrics information about the page that was tested.

First Byte
Start Render
FCP
Speed Index
0.711s 2.100s 2.068s 2.532s

Document Complete

Time
Requests
Bytes In
3.038s 23 320 KB

Fully Loaded

Time
Requests
Bytes In
4.240s 23 320 KB

Content Breakdown

Website content breakdown by MIME type.

MIME Type
Requests
Bytes
js 4 25KB
css 3 31KB
image 12 225KB
font 2 33KB
html 1 9KB
View Full Test in WebPageTest.org