Speed Index: Impact on Search Performance

Measures how quickly page content is visually populated.

Global Average
5.58 s
Good Threshold
< 3.4 s
Correlation
Moderate
Sample Size
23,554

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 480 KB 64 KB 156 KB 771 KB
2-3.4s 843 KB 51 KB 339 KB 1,555 KB
3.4-5.8s 1,101 KB 100 KB 618 KB 2,293 KB
5.8-8s 1,560 KB 134 KB 1,281 KB 3,612 KB
> 8s 2,374 KB 167 KB 894 KB 4,536 KB

SI by Page Type

Page Type Avg. SI Pages Rating
Article / Blog Post 4.01 s 1,548 Needs Work
Static Page 4.44 s 211 Needs Work
FAQ Page 4.54 s 434 Needs Work
Category Page 5.35 s 299 Needs Work
Service Page 5.54 s 140 Needs Work
Product Page 7.37 s 1,697 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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