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
185,133
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 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
20656
41312
0
1–2
3–5
6–10
11–23
24–49
50–107
108–233
234–507
508–1104
1105–2404
>p98
Good (≤0.1)
Needs improvement
Poor (>0.25)
Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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
3,381
90%
0.00
1–2
1,079
88%
0.00
3–5
156
88%
0.00
6–10
73
77%
0.00
11–23
9,689
86%
0.00
24–49
41,312
88%
0.00
50–107
34,133
89%
0.00
108–233
29,608
89%
0.00
234–507
27,860
90%
0.00
508–1104
22,819
89%
0.00
1105–2404
11,392
89%
0.00
>p98
3,631
88%
0.00
Good
Needs Improvement
Poor
Faded rows: under 100 sites
Lab paint timeline — ttfb 114ms. p75 399ms. p99 3.4s. At the low end (0ms): CLS 0.00. At the high end (>p98): CLS 0.00. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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
20358
40715
47–75
76–120
121–191
192–305
306–488
489–779
780–1243
1244–1985
1986–3169
3170–5060
>p98
Good (≤0.1)
Needs improvement
Poor (>0.25)
Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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
47–75
465
88%
0.00
76–120
8,318
93%
0.00
121–191
28,433
91%
0.00
192–305
40,715
89%
0.00
306–488
33,414
89%
0.00
489–779
26,520
88%
0.00
780–1243
19,573
87%
0.00
1244–1985
12,485
87%
0.00
1986–3169
6,378
88%
0.00
3170–5060
3,537
85%
0.00
>p98
3,670
88%
0.00
Good
Needs Improvement
Poor
Faded rows: under 100 sites
Lab paint timeline — fcp 366ms. p75 776ms. p99 10.2s. At the low end (47–75ms): CLS 0.00. At the high end (>p98): CLS 0.00. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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
18656
37312
26–47
48–83
84–149
150–267
268–477
478–854
855–1527
1528–2733
2734–4891
4892–8752
>p98
Good (≤0.1)
Needs improvement
Poor (>0.25)
Site count
The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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
26–47
46
91%
0.00
48–83
1,061
92%
0.00
84–149
10,517
93%
0.00
150–267
29,896
92%
0.00
268–477
37,312
90%
0.00
478–854
32,475
88%
0.00
855–1527
24,321
87%
0.00
1528–2733
14,849
85%
0.00
2734–4891
13,045
86%
0.00
4892–8752
8,933
86%
0.00
>p98
3,519
87%
0.00
Good
Needs Improvement
Poor
Faded rows: under 100 sites
Lab paint timeline — lcp 556ms. p75 1.4s. p99 19.3s. At the low end (26–47ms): CLS 0.00. At the high end (>p98): CLS 0.00. 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 CLS. Lab LCP separates passing sites from failing sites the most. Where the lab LCP is low, 92% of sites pass the CLS. Where it is high, 87% do. The decline is gradual. There is no point where sites suddenly start failing.
Chrome field data from 189,915 sites, representing millions of real page loads.
How we measured.