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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.
120ms
lab TTFB
on the typical page
367ms
lab FCP
on the typical page
559ms
lab LCP
on the typical page
94,841
sites measured
desktop field data
In the lab, the typical site paints its main content after 559ms.
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop 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 10957 21914
0 1–2 3–5 6–10 11–23 24–50 51–108 109–236 237–516 517–1126 1127–2458 >p98
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop 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 51 96% 1.3s
1–2 106 85% 1.5s
3–5 66 77% 1.6s
6–10 37 73% 1.7s
11–23 5,364 88% 1.3s
24–50 21,914 89% 1.2s
51–108 17,504 89% 1.2s
109–236 15,564 90% 1.3s
237–516 14,706 91% 1.4s
517–1126 11,877 83% 1.7s
1127–2458 5,757 58% 2.3s
>p98 1,895 44% 2.8s
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — ttfb 120ms. p75 413ms. p99 3.5s. At the low end (0ms): LCP 1.3s. At the high end (>p98): LCP 2.8s. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
4
Distribution & median LCP site count and median LCP at each level of lab paint timeline — fcp
0ms 750ms 1500ms 2250ms 3000ms
0 9753 19505
55–85 86–131 132–203 204–313 314–483 484–746 747–1153 1154–1780 1781–2750 2751–4247 >p98
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop 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
55–85 506 84% 995ms
86–131 5,432 93% 932ms
132–203 15,117 94% 1.1s
204–313 19,505 92% 1.2s
314–483 16,208 89% 1.3s
484–746 13,064 88% 1.4s
747–1153 9,933 84% 1.7s
1154–1780 6,830 74% 2.0s
1781–2750 3,764 54% 2.4s
2751–4247 1,763 50% 2.5s
>p98 1,880 61% 2.0s
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — fcp 367ms. p75 765ms. p99 5.7s. Spearman with LCP r = +0.40. At the low end (55–85ms): LCP 995ms. At the high end (>p98): LCP 2.0s. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
6
Distribution & median LCP site count and median LCP at each level of lab paint timeline — lcp
0ms 750ms 1500ms 2250ms 3000ms
0 9623 19245
26–46 47–81 82–144 145–255 256–450 451–796 797–1409 1410–2491 2492–4407 4408–7795 >p98
Good (≤2.5s) Needs improvement Poor (>4s) Site count
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop 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
47–81 328 83% 934ms
82–144 4,472 93% 941ms
145–255 14,331 94% 1.0s
256–450 19,245 93% 1.2s
451–796 16,802 90% 1.4s
797–1409 13,205 84% 1.6s
1410–2491 8,327 72% 2.0s
2492–4407 5,971 68% 1.9s
4408–7795 5,639 79% 1.6s
>p98 1,803 71% 1.8s
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — lcp 559ms. p75 1.4s. p99 10.3s. Spearman with LCP r = +0.39. At the low end (47–81ms): LCP 934ms. At the high end (>p98): LCP 1.8s. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · desktop field datacorewebvitals.io/state-of-cwv
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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 TTFB separates passing sites from failing sites the most. 88% of sites at the low end pass the LCP. Past 2.5s, the typical site fails. At the top of the range only 44% pass.
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.