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Advanced Page Speed Test

Core Web Vitals Analysis - Mobile & Desktop

Result for: youtube.com

Tested at: 2026-04-21 02:25:17

📱 Mobile Insights
85

优秀

First Contentful Paint 0.09s Good
Largest Contentful Paint 0.35s Good
Cumulative Layout Shift 0.03 Good
Total Blocking Time 500ms Poor
Speed Index 0.18s Good

⏱️ Timing Breakdown

DNS
Connect
SSL
Server
Download
DNS Lookup3ms
TCP Connection7ms
SSL Handshake9ms
Server Response (TTFB)78ms
Content Download147ms
Total225ms

📄 Page Info

Page Size 290 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 0.15s Good
Largest Contentful Paint 0.37s Good
Cumulative Layout Shift 0.01 Good
Total Blocking Time 500ms Poor
Speed Index 0.17s Good

⏱️ Timing Breakdown

DNS
Connect
SSL
Server
Download
DNS Lookup3ms
TCP Connection8ms
SSL Handshake9ms
Server Response (TTFB)125ms
Content Download81ms
Total206ms

📄 Page Info

Page Size 683 KB
HTTP Status 200

⚠️ Issues Found

⚠️

Render Blocking Resources

14 CSS/JS files block rendering

Impact: High