core-js vs Swiffy Slider

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

Top sites by authority

core-js · Swiffy Slider · 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

core-js · Swiffy Slider · share of sites in each country using one or the other

United States 1,263,779

279

India 417,895

217

Brazil 395,615

123

United Kingdom 393,397

197

Germany 379,059

158

France 302,681

242

Italy 291,847

279

Canada 287,813

109

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, Oct 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 core-js sites · All Swiffy Slider sites