Fast Bundle vs Vitals

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

Top sites by authority

Fast Bundle · Vitals · 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

Fast Bundle · Vitals · share of sites in each country using one or the other

United States 3,358

3,566

United Kingdom 1,494

1,463

India 1,194

1,304

Canada 1,079

1,060

Germany 1,141

990

Australia 996

984

France 864

979

Italy 644

647

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 Fast Bundle sites · All Vitals sites