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
3
Open Page Rank 8+
5,108
6
Open Page Rank 7+
26,213
9
Open Page Rank 6+
57,082
12
Open Page Rank 5+
109,074
15
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
1,479,835
72
India
495,926
57
United Kingdom
457,421
42
Germany
439,161
44
Brazil
420,075
35
France
369,824
32
Canada
341,001
36
Italy
336,371
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, 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.