Apache Traffic Server vs IIS
Head-to-head usage across the sites we track.
Top sites by authority
Apache Traffic Server · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
3
61
Open Page Rank 8+
19
1,315
Open Page Rank 7+
34
5,213
Open Page Rank 6+
55
9,906
Open Page Rank 5+
84
16,556
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Apache Traffic Server · IIS · share of sites in each country using one or the other
United States
1,480
136,825
India
448
68,343
United Kingdom
426
49,161
Italy
248
46,831
Brazil
211
38,951
Türkiye
159
36,724
Canada
420
36,284
Germany
382
36,200
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Apache Traffic Server | IIS |
|---|---|---|
| LCP | 1.7 s | 1.7 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 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.