The State of Web Vitals

Unused JavaScript bytes on Wix sites

Of the JavaScript shipped, how much actually ran during load (used vs unused bytes, Chrome coverage).

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

27.9% of Wix sites use 850 KB to 1.5 MB of unused JS unused JavaScript bytes, and 100% of those sites have a good INP, against 100% of all Wix sites.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Core Web Vitals pass rate

Sites with 850 KB to 1.5 MB of unused JS unused JavaScript bytes have a good INP most often: 100%, against 100% of all Wix sites. Sites with over 1.5 MB of unused JS unused JS have it least often, at 100%.

SitesGood, needs improvement, poor INPMedian
All Wix sites728100%37ms
850 KB to 1.5 MB unused 27.9%162100%32ms
Over 1.5 MB unused 72.1%565100%39ms
400 to 850 KB unusedno field data
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Unused JavaScript bytes usage

Over 1.5 MB of unused JS is the most used: 72.1% of Wix sites. 850 KB to 1.5 MB of unused JS is 27.9% of Wix sites.

Over 1.5 MB unused 72.1% 850 KB to 1.5 MB unused 27.9%
Over 1.5 MB unused 72.1% 850 KB to 1.5 MB unused 27.9% 400 to 850 KB unused <0.1%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Unused JavaScript bytes per framework

On React, 72% of sites use over 1.5 MB of unused JS unused JavaScript bytes, and 100% of React sites have a good INP, against 100% of all sites.

FrameworkUnused JavaScript bytes on its sitesGood INP
All Wix sites 5,621 sitesOver 1.5 MB unused 72%850 KB to 1.5 MB unused 28%100%
React 5,620 sitesOver 1.5 MB unused 72%850 KB to 1.5 MB unused 28%100%
Over 1.5 MB unused 850 KB to 1.5 MB unused 400 to 850 KB unused
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Unused JavaScript bytes or the framework

Does the framework explain the unused JavaScript bytes difference?

On React, 100% of sites with 850 KB to 1.5 MB of unused JS unused JavaScript bytes have a good INP, against 100% of React sites with over 1.5 MB of unused JS. Within React, sites with 850 KB to 1.5 MB of unused JS and over 1.5 MB of unused JS have a good INP about equally often.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals Image source mix → Page weight & requests → DOM depth → Scripts per page → By Arjen Karel · 5,621 crawled Wix sites (728 with desktop Chrome field data, October 2026) · How we measured