TTFB distribution
How TTFB is distributed across real-user data, plus pass-rate breakdown.
1
At a glance the headline numbers for TTFB distribution
How TTFB is distributed across real-user data, plus pass-rate breakdown.
1.2s
TTFB (p75)
58.8% good
662ms
TTFB (median)
4.2s
TTFB (p99)
Long tail
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
2
TTFB Distribution page loads across good, needs improvement and poor
0 4,267 8,533 12,800 17,066
p50 = 662ms
p75 = 1.2s
p90 = 2s
p99 = 4.2s
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: 88,143 sites
TTFB 662ms. p75 1.2s. p99 4.2s. 58.8% pass.
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
3
TTFB Pass Rates share per category
Good Needs Improvement Poor
TTFB passes on 58.8% of sites. 29.2% need improvement, 12.0% fail.
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
Related signals FCP → LCP → CLS → INP → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.