core-js vs MochiKit
Head-to-head usage across the sites we track.
Top sites by authority
core-js · MochiKit · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
242
2
Open Page Rank 8+
5,039
5
Open Page Rank 7+
25,753
8
Open Page Rank 6+
55,778
9
Open Page Rank 5+
106,331
11
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 · MochiKit · share of sites in each country using one or the other
United States
1,295,217
67
India
433,567
47
Brazil
406,300
29
United Kingdom
402,603
36
Germany
384,505
38
France
315,055
33
Italy
302,259
29
Canada
295,823
35
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | core-js | MochiKit |
|---|---|---|
| LCP | 2 s | 1.9 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 700 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.
MochiKit to core-js
| Domain | When |
|---|---|
| eakcds.com | May 2026 |