1
At a glance the headline numbers for Lab paint timeline
Lab paint timeline on a cold crawl: TTFB, FCP, LCP in ms - setup-specific, not field data.
114ms
lab TTFB
on the typical page
366ms
lab FCP
on the typical page
556ms
lab LCP
on the typical page
185,348
sites measured
phone field data
In the lab, the typical site paints its main content after 556ms.
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
2
Distribution & median LCP site count and median LCP at each level of lab paint timeline — ttfb
0ms 1250ms 2500ms 3750ms 5000ms
0 43247 86494
0–99 100–199 200–299 300–399 400–499 500–599 600–699 700–799 800–899 900–999 1000+
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
3
Passing LCP by lab paint timeline — ttfb which level passes the LCP most often
Lab paint timeline — ttfbSitesPassing LCPLCP
0–99 86,494 87% 1.4s
100–199 27,580 89% 1.4s
200–299 14,515 88% 1.5s
300–399 10,443 85% 1.6s
400–499 7,871 83% 1.7s
500–599 6,194 80% 1.8s
600–699 4,941 76% 1.9s
700–799 3,939 74% 2.0s
800–899 3,253 68% 2.1s
900–999 2,666 65% 2.2s
1000+ 17,452 44% 2.7s
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — ttfb 114ms. p75 399ms. p99 3.4s. At the low end (0–99ms): LCP 1.4s. At the high end (1000+ms): LCP 2.7s. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
4
Distribution & median LCP site count and median LCP at each level of lab paint timeline — fcp
0ms 1250ms 2500ms 3750ms 5000ms
0 30210 60420
0–249 250–499 500–749 750–999 1000–1249 1250–1499 1500–1749 1750+
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
5
Passing LCP by lab paint timeline — fcp which level passes the LCP most often
Lab paint timeline — fcpSitesPassing LCPLCP
0–249 60,420 92% 1.2s
250–499 52,470 88% 1.4s
500–749 23,166 82% 1.7s
750–999 13,077 76% 1.9s
1000–1249 8,650 69% 2.1s
1250–1499 5,799 61% 2.3s
1500–1749 4,011 51% 2.5s
1750+ 16,127 47% 2.6s
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — fcp 366ms. p75 776ms. p99 10.2s. At the low end (0–249ms): LCP 1.2s. At the high end (1750+ms): LCP 2.6s. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
6
Distribution & median LCP site count and median LCP at each level of lab paint timeline — lcp
0ms 1250ms 2500ms 3750ms 5000ms
0 40835 81670
0–499 500–999 1000–1499 1500–1999 2000–2499 2500–2999 3000–3499 3500–3999 4000–4499 4500+
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
7
Passing LCP by lab paint timeline — lcp which level passes the LCP most often
Lab paint timeline — lcpSitesPassing LCPLCP
0–499 81,670 92% 1.3s
500–999 37,049 84% 1.6s
1000–1499 16,429 71% 2.0s
1500–1999 8,795 59% 2.3s
2000–2499 5,047 51% 2.5s
2500–2999 3,067 47% 2.6s
3000–3499 2,832 54% 2.4s
3500–3999 3,214 72% 1.7s
4000–4499 3,290 76% 1.7s
4500+ 14,786 69% 1.9s
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — lcp 556ms. p75 1.4s. p99 19.3s. At the low end (0–499ms): LCP 1.3s. At the high end (4500+ms): LCP 1.9s. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone field datacorewebvitals.io/state-of-cwv
8
Why this matters for the Core Web Vitals, and where to start fixing it
These are lab numbers from our crawler: one cold load, one machine, one network profile. They are not what your visitors feel. That is what the field data on the rest of this site measures. What the lab gives you is a controlled comparison: identical conditions for every site, so a difference between two sites is a real difference between the pages.
Read the gaps. Lab LCP far worse than field LCP usually means caching and repeat visits carry the field numbers. The reverse usually means the crawler's connection is kinder than your visitors' phones.
How does this affect the Core Web Vitals?
Lab paint timeline correlates with the LCP. Lab FCP separates passing sites from failing sites the most. 92% of sites at the low end pass the LCP. Past 1750+, the typical site fails. At the top of the range only 47% pass.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.