core-js vs Xajax
Head-to-head usage across the sites we track.
Top sites by authority
core-js · Xajax · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
242
0
Open Page Rank 8+
5,039
6
Open Page Rank 7+
25,753
15
Open Page Rank 6+
55,778
27
Open Page Rank 5+
106,331
44
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 · Xajax · share of sites in each country using one or the other
United States
1,295,217
194
India
433,567
89
Brazil
406,300
146
United Kingdom
402,603
124
Germany
384,505
213
France
315,055
140
Italy
302,259
119
Canada
295,823
73
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | core-js | Xajax |
|---|---|---|
| LCP | 2 s | 1.5 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 600 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
core-js to Xajax
| Domain | When |
|---|---|
| casella.rs | Nov 2025 |
Xajax to core-js
| Domain | When |
|---|---|
| platformapacjenta.pl | Jul 2026 |
| corghi.es | Jun 2026 |
| swarganga.org | Mar 2026 |