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
desktop field data
In the lab, the typical site paints its main content after 556ms.
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 · desktop 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
82%
0.02
1–2
1,079
80%
0.02
3–5
156
96%
0.02
6–10
73
70%
0.03
11–23
9,689
76%
0.03
24–49
41,312
78%
0.02
50–107
34,133
78%
0.03
108–233
29,608
78%
0.03
234–507
27,860
79%
0.03
508–1104
22,819
78%
0.03
1105–2404
11,392
74%
0.04
>p98
3,631
75%
0.04
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 0.02. At the high end (>p98): CLS 0.04. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 · desktop 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
84%
0.01
76–120
8,318
83%
0.01
121–191
28,433
81%
0.02
192–305
40,715
78%
0.03
306–488
33,414
78%
0.03
489–779
26,520
77%
0.03
780–1243
19,573
76%
0.03
1244–1985
12,485
75%
0.04
1986–3169
6,378
74%
0.04
3170–5060
3,537
72%
0.04
>p98
3,670
78%
0.03
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 0.01. At the high end (>p98): CLS 0.03. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 · desktop 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
86%
0.02
48–83
1,061
82%
0.01
84–149
10,517
83%
0.01
150–267
29,896
82%
0.02
268–477
37,312
80%
0.03
478–854
32,475
77%
0.03
855–1527
24,321
75%
0.03
1528–2733
14,849
74%
0.04
2734–4891
13,045
74%
0.04
4892–8752
8,933
74%
0.04
>p98
3,519
75%
0.04
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 0.02. At the high end (>p98): CLS 0.04. computed
The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 TTFB separates passing sites from failing sites the most. Where the lab TTFB is low, 82% of sites pass the CLS. Where it is high, 75% 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.