Lazy.js vs RequireJS
Head-to-head usage across the sites we track.
Detections for Lazy.js end in May 2020. The fingerprint catalog behind our crawls no longer carries that technology as its own entry, usually because it was retired or split into more specific ones, so its figure is the last recorded and is not directly comparable with a currently tracked technology.
Top sites by authority
Lazy.js · RequireJS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Lazy.js · RequireJS · share of sites in each country using one or the other
United States
962
126,047
United Kingdom
600
39,713
Germany
613
37,781
India
559
30,133
Canada
530
28,265
France
471
27,527
Brazil
400
25,881
Spain
494
19,648
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Lazy.js | RequireJS |
|---|---|---|
| LCP | 1.9 s | 1.6 s |
| INP | 100 ms | 50 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.