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 215,676

7,818

India 110,602

4,966

Japan 82,773

1,576

Brazil 80,295

2,559

France 74,632

2,508

United Kingdom 72,179

3,120

Spain 67,753

2,069

Italy 63,679

1,731

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, Jun 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