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 · All devices 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.

66.5%
of sites good on TTFB
535ms
Typical site
1.9s
Worst 10% of sites

66.5% of sites good on TTFB. The typical site's TTFB is 535ms. The worst 10% are above 1.9s.

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

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

0 597 1,194 1,791 2,388
0–150ms10 sites0.1% of all sites
150–300ms1,152 sites13.4% of all sites
300–450ms2,388 sites27.7% of all sites
450–600ms1,228 sites14.2% of all sites
600–750ms773 sites9% of all sites
750–900ms489 sites5.7% of all sites
900–1050ms406 sites4.7% of all sites
1050–1200ms290 sites3.4% of all sites
1200–1350ms272 sites3.2% of all sites
1350–1500ms228 sites2.6% of all sites
1500–1650ms191 sites2.2% of all sites
1650–1800ms174 sites2% of all sites
1800–1950ms173 sites2% of all sites
1950–2100ms150 sites1.7% of all sites
2100–2250ms115 sites1.3% of all sites
2250–2400ms111 sites1.3% of all sites
2400ms and up476 sites5.5% of all sites
p50 = 535ms
p75 = 1.1s
p90 = 1.9s
p99 = 4.1s
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: 8,626 sites

Most sites are good on TTFB. 66.5% sit at or under 800ms. The typical site is at 535ms, and 75% of sites stay under 1.1s. Only 33.5% miss good TTFB. The slowest 10% are above 1.9s, and the slowest 1% are above 4.1s.

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

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

TTFB
66.5%
21.7%
11.9%
Good Needs Improvement Poor

66.5% of sites are good on TTFB. 21.7% are in the needs improvement band, between 800ms and 1.8s. 11.9% are poor, above 1.8s. Misses split about evenly between the two.

The State of Web Vitals · October 2026 · React sites (9,570) · all devices 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