core-js vs OpenCV
Head-to-head usage across the sites we track.
Top sites by authority
core-js · OpenCV · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
243
0
Open Page Rank 8+
5,081
0
Open Page Rank 7+
26,045
0
Open Page Rank 6+
56,582
0
Open Page Rank 5+
107,942
0
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 · OpenCV · share of sites in each country using one or the other
United States
1,320,418
2
India
439,882
1
Brazil
411,231
1
United Kingdom
404,005
1
Germany
391,462
2
France
311,727
1
Canada
298,167
1
Italy
291,018
1
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | core-js | OpenCV |
|---|---|---|
| LCP | 2 s | 2.6 s |
| INP | 75 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 800 ms |
Median site's p75 values from the Chrome UX Report, Aug 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.