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Speed Index: Impact on Search Performance

Measures how quickly page content is visually populated.

Global Average
5.75 s
Good Threshold
< 3.4 s
Correlation
Strong
Sample Size
30,034

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 347 KB 47 KB 133 KB 581 KB
2-3.4s 794 KB 50 KB 238 KB 1,382 KB
3.4-5.8s 1,080 KB 89 KB 445 KB 2,184 KB
5.8-8s 1,450 KB 123 KB 1,083 KB 3,542 KB
> 8s 2,630 KB 183 KB 1,349 KB 5,561 KB

SI by Page Type

Page Type Avg. SI Pages Rating
Static Page 4.08 s 479 Needs Work
Article / Blog Post 4.13 s 2,688 Needs Work
Home Page 4.59 s 60 Needs Work
FAQ Page 4.62 s 829 Needs Work
Category Page 5.18 s 343 Needs Work
Product Page 7.15 s 2,130 Poor
Service Page 8.01 s 168 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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