The State of Web Vitals

Synthetic paint milestones on Wix sites

62.8% of audited sites (3,532) paint their hero element in under 300ms in the lab and pass field LCP at 96% (1.1s median), while the 20.8% exceeding 1,500ms in the lab pass field LCP at just 90% (1.3s median).

Field data PhoneDesktopAll Scope All sites October 2026 edition · All devices field outcomes · Wix sites only
Wix Scoped to 5,623 sites out of 203,892 analyzed (cms) Compare with all sites →

62.8% of Wix sites use under 300ms lab LCP synthetic paint milestones, and 96% of those sites have a good LCP, against 94% of all Wix sites.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
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LCP pass rate

Sites with under 300ms lab LCP synthetic paint milestones have a good LCP most often: 96%, against 94% of all Wix sites. Sites with over 1,500ms lab LCP lab paint time have it least often, at 90%.

SitesGood, needs improvement, poor LCPMedian
All Wix sites5,33394%1.2s
Under 300ms lab LCP 62.8%3,34296%1.1s
600 to 1,500ms lab LCP 4.9%25592%1.3s
300 to 600ms lab LCP 11.4%62091%1.4s
Over 1,500ms lab LCP 20.8%1,11590%1.3s
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
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Synthetic paint milestones usage

Under 300ms lab LCP is the most used: 62.8% of Wix sites.

Under 300ms lab LCP 62.8% Over 1,500ms lab LCP 20.8% 300 to 600ms lab LCP 11.4%
Under 300ms lab LCP 62.8% Over 1,500ms lab LCP 20.8% 300 to 600ms lab LCP 11.4% 600 to 1,500ms lab LCP 4.9%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
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The four LCP phases

Across the four LCP sub-parts in Chrome's field data, the largest gap between under 300ms lab LCP and over 1,500ms lab LCP sits in resource load delay: 434 ms median for under 300ms lab LCP against 495 ms for over 1,500ms lab LCP. Overall median field LCP is 1.1s for under 300ms lab LCP (TTFB 407 ms, load delay 434 ms, load duration 132 ms, render delay 152 ms) versus 1.3s for over 1,500ms lab LCP.

Median LCP phase breakdown (Chrome field p75) Load delay Median LCP
Wix sites with synthetic paint milestones 3,944419 ms455 ms151 ms455 mslab 455 ms1.2s
Under 300ms lab LCP 2,457407 ms434 ms152 ms434 mslab 434 ms1.1s
600 to 1,500ms lab LCP 189490 ms485 ms149 ms485 mslab 485 ms1.3s
Over 1,500ms lab LCP 821435 ms495 ms151 ms495 mslab 495 ms1.3s
300 to 600ms lab LCP 477458 ms509 ms169 ms149 ms509 mslab 509 ms1.3s
TTFB Resource load delay Resource load time Element render delay
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
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Synthetic paint milestones per framework

React sets the synthetic paint milestones to under 300ms lab LCP on 63% of its sites, and 94% of React sites have a good LCP, against 94% of all sites.

FrameworkSynthetic paint milestones on its sitesGood LCP
Wix sites with synthetic paint milestones 5,620 sitesUnder 300ms lab LCP 63%Over 1,500ms lab LCP 21%300 to 600ms lab LCP 11%94%
React 5,619 sitesUnder 300ms lab LCP 63%Over 1,500ms lab LCP 21%300 to 600ms lab LCP 11%94%
Under 300ms lab LCP Over 1,500ms lab LCP 300 to 600ms lab LCP 600 to 1,500ms lab LCP
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
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Synthetic paint milestones or the framework

Does the framework explain the synthetic paint milestones difference?

On React, 96% of sites with under 300ms lab LCP synthetic paint milestones have a good LCP, against 90% of React sites with over 1,500ms lab LCP. Within React, sites with under 300ms lab LCP have a good LCP more often.

How clean lab paint timings translate to real-user field LCP

Synthetic paint milestones measure your page without real-user cellular latency or cold device caches. A page that already takes over 1.5 seconds in a fast lab environment rarely survives real-world mobile networks. Across 3,532 sites (62.8%) painting under 300ms in the lab, 96% pass field LCP (1.1s median), dropping to 90% (1.3s median) on the 20.8% (1,171) over 1,500ms.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
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Understanding synthetic paint milestones

Optimize unthrottled server TTFB and eliminate render-blocking head resources so the baseline paint path finishes in under 600ms in clean lab conditions. Across all audited sites, 62.8% finish lab LCP under 300ms (96% good LCP, 1.1s median) versus 20.8% above 1,500ms (90% good LCP, 1.3s median).

Go fix it How we measured → Chrome DevTools network settings for CWV testing →
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,620 sites with synthetic paint milestonesBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals Total Blocking Time (lab) → Main-thread CPU (lab) → Document lifecycle (lab) → By Arjen Karel · 5,621 crawled Wix sites (5,333 with all devices Chrome field data, 5,620 sites with synthetic paint milestones, October 2026) · How we measured