Boba.js vs core-js
Head-to-head usage across the sites we track.
Top sites by authority
Boba.js · core-js · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
243
Open Page Rank 8+
0
5,073
Open Page Rank 7+
0
25,858
Open Page Rank 6+
0
56,024
Open Page Rank 5+
0
106,806
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Boba.js · core-js · share of sites in each country using one or the other
United States
9
1,295,217
India
10
433,567
Brazil
3
406,300
United Kingdom
5
402,603
Germany
8
384,505
France
3
315,055
Italy
5
302,259
Canada
3
295,823
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Boba.js | core-js |
|---|---|---|
| LCP | 1.9 s | 2 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 900 ms | 800 ms |
Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.