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Advanced Page Speed Test

Core Web Vitals Analysis - Mobile & Desktop

Result for: youtube.com

Tested at: 2026-04-24 17:54:47

📱 Mobile Insights
85

优秀

First Contentful Paint 0.38s Good
Largest Contentful Paint 0.64s Good
Cumulative Layout Shift 0.03 Good
Total Blocking Time 500ms Poor
Speed Index 0.45s Good

⏱️ Timing Breakdown

DNS
Connect
SSL
Server
Download
DNS Lookup5ms
TCP Connection10ms
SSL Handshake15ms
Server Response (TTFB)316ms
Content Download244ms
Total560ms

📄 Page Info

Page Size 292 KB
HTTP Status 200

⚠️ Issues Found

⚠️

Render Blocking Resources

3 CSS/JS files block rendering

Impact: High
🖥️ Desktop Insights
85

优秀

First Contentful Paint 0.17s Good
Largest Contentful Paint 0.43s Good
Cumulative Layout Shift 0.01 Good
Total Blocking Time 500ms Poor
Speed Index 0.25s Good

⏱️ Timing Breakdown

DNS
Connect
SSL
Server
Download
DNS Lookup3ms
TCP Connection7ms
SSL Handshake8ms
Server Response (TTFB)140ms
Content Download170ms
Total309ms

📄 Page Info

Page Size 685 KB
HTTP Status 200

⚠️ Issues Found

⚠️

Render Blocking Resources

14 CSS/JS files block rendering

Impact: High