Site Kit vs Vercel Speed Insights

Head-to-head usage across the sites we track.

Top sites by authority

Site Kit · Vercel Speed Insights · how many of each technology's sites sit in the web's highest authority tiers

Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.

By country

Site Kit · Vercel Speed Insights · share of sites in each country using one or the other

United States 194,442

9,182

India 96,669

5,324

Brazil 73,670

2,673

Japan 73,684

1,537

United Kingdom 63,934

3,111

France 62,421

2,407

Spain 58,678

2,022

Italy 55,218

1,742

Audience countries from the Chrome UX Report, top markets of either technology.

Real user performance

Median site's p75 values from the Chrome UX Report, Aug 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.

Sites that switched

Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.

All Site Kit sites · All Vercel Speed Insights sites