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.
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
all-device field data
In the lab, the typical site paints its main content after 559ms.
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
2
Distribution & median CLS site count and median CLS at each level of lab paint timeline — ttfb
0.00 0.04 0.08 0.11 0.15
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 (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
3
Passing CLS by lab paint timeline — ttfb which level passes the CLS most often
Lab paint timeline — ttfbSitesPassing CLSCLS
0 51 88% 0.01
1–2 106 85% 0.00
3–5 66 88% 0.00
6–10 37 75% 0.01
11–23 5,364 85% 0.00
24–50 21,914 88% 0.00
51–108 17,504 88% 0.00
109–236 15,564 88% 0.00
237–516 14,706 89% 0.00
517–1126 11,877 88% 0.00
1127–2458 5,757 87% 0.00
>p98 1,895 86% 0.01
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — ttfb 120ms. p75 413ms. p99 3.5s. At the low end (0ms): CLS 0.01. At the high end (>p98): CLS 0.01. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
4
Distribution & median CLS site count and median CLS at each level of lab paint timeline — fcp
0.00 0.04 0.08 0.11 0.15
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 (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
5
Passing CLS by lab paint timeline — fcp which level passes the CLS most often
Lab paint timeline — fcpSitesPassing CLSCLS
55–85 506 90% 0.00
86–131 5,432 91% 0.00
132–203 15,117 90% 0.00
204–313 19,505 88% 0.00
314–483 16,208 88% 0.00
484–746 13,064 87% 0.00
747–1153 9,933 86% 0.00
1154–1780 6,830 87% 0.01
1781–2750 3,764 85% 0.01
2751–4247 1,763 84% 0.01
>p98 1,880 85% 0.01
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — fcp 367ms. p75 765ms. p99 5.7s. At the low end (55–85ms): CLS 0.00. At the high end (>p98): CLS 0.01. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
6
Distribution & median CLS site count and median CLS at each level of lab paint timeline — lcp
0.00 0.04 0.08 0.11 0.15
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 (≤0.1) Needs improvement Poor (>0.25) Site count
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
7
Passing CLS by lab paint timeline — lcp which level passes the CLS most often
Lab paint timeline — lcpSitesPassing CLSCLS
26–46 14 100% 0.00
47–81 328 90% 0.00
82–144 4,472 92% 0.00
145–255 14,331 92% 0.00
256–450 19,245 90% 0.00
451–796 16,802 87% 0.00
797–1409 13,205 86% 0.00
1410–2491 8,327 85% 0.01
2492–4407 5,971 84% 0.01
4408–7795 5,639 85% 0.01
>p98 1,803 82% 0.01
Good Needs Improvement Poor Faded rows: under 100 sites
Lab paint timeline — lcp 559ms. p75 1.4s. p99 10.3s. At the low end (26–46ms): CLS 0.00. At the high end (>p98): CLS 0.01. computed
The State of Web Vitals · Q1 2026 · 94,910 sites · all devices 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 CLS. Lab LCP separates passing sites from failing sites the most. Where the lab LCP is low, 90% of sites pass the CLS. Where it is high, 82% do. The decline is gradual. There is no point where sites suddenly start failing.
Chrome field data from 94,910 sites, representing millions of real page loads. How we measured.