K2 vs RSS
Head-to-head usage across the sites we track.
Top sites by authority
K2 · RSS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
177
Open Page Rank 8+
14
3,520
Open Page Rank 7+
31
16,132
Open Page Rank 6+
41
34,276
Open Page Rank 5+
73
67,039
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
K2 · RSS · share of sites in each country using one or the other
United States
311
865,432
India
120
329,297
Germany
318
327,527
Japan
55
314,790
United Kingdom
160
281,660
Italy
331
272,529
France
155
271,657
Brazil
100
255,443
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | K2 | RSS |
|---|---|---|
| LCP | 1.9 s | 2.1 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 900 ms | 1100 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.
K2 to RSS
| Domain | When |
|---|---|
| fairclothreynolds.com.au | Jul 2026 |
| white-pearl-beach.de | May 2026 |
| greatplainstribalhealth.org | Apr 2026 |
| mittelschule-rottenmann.at | Feb 2026 |