core-js vs LazySizes unveilhooks plugin

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

Top sites by authority

core-js · LazySizes unveilhooks plugin · 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 · LazySizes unveilhooks plugin · share of sites in each country using one or the other

United States 1,479,835

3,197

India 495,926

1,110

United Kingdom 457,421

1,057

Germany 439,161

1,663

Brazil 420,075

2,209

France 369,824

1,121

Canada 341,001

1,078

Italy 336,371

823

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 core-js sites · All LazySizes unveilhooks plugin sites