Measures how quickly page content is visually populated.
How search visibility changes as SI gets slower
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Average CTR for pages in each SI bucket
Where pages rank based on their SI performance
Average resource sizes for pages in each performance bucket
| SI Range | JS | CSS | Images | Total |
|---|---|---|---|---|
| < 2s | 377 KB | 33 KB | 102 KB | 666 KB |
| 2-3.4s | 842 KB | 45 KB | 262 KB | 1,482 KB |
| 3.4-5.8s | 1,065 KB | 99 KB | 392 KB | 2,116 KB |
| 5.8-8s | 1,248 KB | 137 KB | 753 KB | 2,649 KB |
| > 8s | 1,820 KB | 149 KB | 1,613 KB | 4,220 KB |
| Page Type | Avg. SI | Pages | Rating |
|---|---|---|---|
| FAQ Page | 3.51s | 75 | Needs Work |
| Static Page | 4.53s | 73 | Needs Work |
| Article / Blog Post | 4.87s | 360 | Needs Work |
| Category Page | 5.39s | 165 | Needs Work |
| Product Page | 6.44s | 784 | Poor |
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.
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