RSS vs SPDY
Head-to-head usage across the sites we track.
Top sites by authority
RSS · SPDY · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
181
0
Open Page Rank 8+
3,566
0
Open Page Rank 7+
16,531
1
Open Page Rank 6+
35,345
1
Open Page Rank 5+
69,395
3
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
RSS · SPDY · share of sites in each country using one or the other
United States
1,004,186
24
India
387,591
78
Germany
374,574
10
Japan
368,498
10
United Kingdom
325,245
12
France
320,975
8
Italy
302,692
6
Brazil
292,059
10
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | RSS | SPDY |
|---|---|---|
| LCP | 2.1 s | 2.2 s |
| INP | 50 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 1100 ms | 1000 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.