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Speed Index: Impact on Search Performance

Measures how quickly page content is visually populated.

Global Average
6.38 s
Good Threshold
< 3.4 s
Correlation
Moderate
Sample Size
34,797

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 319 KB 44 KB 145 KB 605 KB
2-3.4s 785 KB 47 KB 214 KB 1,387 KB
3.4-5.8s 896 KB 84 KB 538 KB 2,000 KB
5.8-8s 1,464 KB 116 KB 825 KB 3,278 KB
> 8s 2,836 KB 200 KB 1,299 KB 5,950 KB

SI by Page Type

Page Type Avg. SI Pages Rating
Static Page 4.43 s 913 Needs Work
FAQ Page 4.87 s 1,760 Needs Work
Article / Blog Post 5.38 s 5,962 Needs Work
Home Page 5.58 s 93 Needs Work
Category Page 6.14 s 557 Poor
Service Page 8.06 s 286 Poor
Product Page 8.6 s 3,402 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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