seojuice

Speed Index: Impact on Search Performance

Measures how quickly page content is visually populated.

Global Average
5.54 s
Good Threshold
< 3.4 s
Correlation
Strong
Sample Size
40,522

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 262 KB 57 KB 301 KB 730 KB
2-3.4s 730 KB 60 KB 340 KB 1,443 KB
3.4-5.8s 888 KB 97 KB 595 KB 1,997 KB
5.8-8s 1,567 KB 138 KB 666 KB 3,196 KB
> 8s 2,083 KB 172 KB 1,117 KB 4,586 KB

SI by Page Type

Page Type Avg. SI Pages Rating
Static Page 4.51 s 1,106 Needs Work
FAQ Page 5.08 s 2,793 Needs Work
Article / Blog Post 5.31 s 9,359 Needs Work
Service Page 5.46 s 734 Needs Work
Home Page 5.67 s 115 Needs Work
About Page 5.69 s 58 Needs Work
Category Page 6.14 s 741 Poor
Product Page 6.77 s 4,183 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

Want deeper SEO insights for your site?

SEOJuice automatically optimizes your SEO with AI-powered internal linking, on-page fixes, and more.

Start 7-day trial →