Cart.js vs core-js
Head-to-head usage across the sites we track.
Top sites by authority
Cart.js · core-js · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
242
Open Page Rank 8+
1
5,108
Open Page Rank 7+
1
26,213
Open Page Rank 6+
5
57,082
Open Page Rank 5+
24
109,074
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Cart.js · core-js · share of sites in each country using one or the other
United States
423
1,479,835
India
136
495,926
United Kingdom
166
457,421
Germany
76
439,161
Brazil
33
420,075
France
76
369,824
Canada
165
341,001
Italy
54
336,371
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cart.js | core-js |
|---|---|---|
| LCP | 1.6 s | 2 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 500 ms | 800 ms |
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.