The State of Web Vitals

TTFB distribution React sites

How TTFB is distributed across real-user data, plus pass-rate breakdown.

Field data PhoneDesktopAll Scope All sites October 2026 edition · Phone field outcomes · React sites only
React Scoped to 9,570 sites out of 210,902 analyzed (frameworks) Compare with all sites →
1

At a glance the headline numbers for TTFB distribution

How TTFB is distributed across real-user data, plus pass-rate breakdown.

68.3%
of sites good on TTFB
511ms
Typical site
1.9s
Worst 10% of sites

68.3% of sites good on TTFB. The typical site's TTFB is 511ms. The worst 10% are above 1.9s.

The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
2

The TTFB distribution site count at each TTFB, from good to poor

0 383 766 1,149 1,532
0–150ms4 sites0.1% of all sites
150–300ms698 sites13.4% of all sites
300–450ms1,532 sites29.4% of all sites
450–600ms780 sites15% of all sites
600–750ms444 sites8.5% of all sites
750–900ms282 sites5.4% of all sites
900–1050ms234 sites4.5% of all sites
1050–1200ms187 sites3.6% of all sites
1200–1350ms162 sites3.1% of all sites
1350–1500ms135 sites2.6% of all sites
1500–1650ms97 sites1.9% of all sites
1650–1800ms94 sites1.8% of all sites
1800–1950ms99 sites1.9% of all sites
1950–2100ms68 sites1.3% of all sites
2100–2250ms66 sites1.3% of all sites
2250–2400ms57 sites1.1% of all sites
2400ms and up269 sites5.2% of all sites
p50 = 511ms
p75 = 1s
p90 = 1.9s
p99 = 3.9s
0–150 150–300 300–450 450–600 600–750 750–900 900–1050 1050–1200 1200–1350 1350–1500 1500–1650 1650–1800 1800–1950 1950–2100 2100–2250 2250–2400 2400+
Good (≤800ms) Needs improvement Poor (>1.8s) Percentile markers Total: 5,208 sites

Most sites are good on TTFB. 68.3% sit at or under 800ms. The typical site is at 511ms, and 75% of sites stay under 1.0s. Only 31.7% miss good TTFB. The slowest 10% are above 1.9s, and the slowest 1% are above 3.9s.

The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
3

The TTFB pass rate the share of sites that are good, needs improvement and poor

TTFB
68.3%
21%
10.7%
Good Needs Improvement Poor

68.3% of sites are good on TTFB. 21.0% are in the needs improvement band, between 800ms and 1.8s. 10.7% are poor, above 1.8s. Misses split about evenly between the two.

The State of Web Vitals · October 2026 · React sites (9,570) · phone field datacorewebvitals.io/state-of-cwv
Related signals FCP → LCP → CLS → INP → 210,902 crawled sites with Chrome field data, representing millions of real page loads · How we measured