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Speed Index: Impact on Search Performance

Measures how quickly page content is visually populated.

Global Average
6.3 s
Good Threshold
< 3.4 s
Correlation
Moderate
Sample Size
31,998

Search Impressions by SI Range

How search visibility changes as SI gets slower

Click-Through Rate by SI Range

Average CTR for pages in each SI bucket

Average Position by SI Range

Where pages rank based on their SI performance

Resource Budget by SI Range

Average resource sizes for pages in each performance bucket

SI Range JS CSS Images Total
< 2s 284 KB 43 KB 142 KB 560 KB
2-3.4s 807 KB 46 KB 195 KB 1,419 KB
3.4-5.8s 927 KB 85 KB 501 KB 2,018 KB
5.8-8s 1,537 KB 109 KB 1,041 KB 3,692 KB
> 8s 2,860 KB 196 KB 1,265 KB 6,048 KB

SI by Page Type

Page Type Avg. SI Pages Rating
Static Page 4.01 s 668 Needs Work
FAQ Page 4.52 s 1,046 Needs Work
Article / Blog Post 4.71 s 3,765 Needs Work
Home Page 5.23 s 75 Needs Work
Category Page 5.84 s 425 Poor
Product Page 8.09 s 2,885 Poor
Service Page 9.22 s 202 Poor

Frequently Asked Questions

What Speed Index should I target?

A Speed Index under 3.4 seconds is considered good by Lighthouse. Speed Index captures the overall visual loading experience, making it a useful holistic metric alongside Core Web Vitals.

Other Metrics

LCP CLS INP FCP TTFB FID

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