The State of Web Vitals

HTML document size on Wix sites

The transfer size of the HTML document.

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

97.5% of Wix sites use over 75 KB of HTML initial HTML document size, and 94% 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 · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
1

Core Web Vitals pass rate

Sites with over 75 KB of HTML initial HTML document size have a good LCP most often: 94%, against 94% of all Wix sites.

SitesGood, needs improvement, poor LCPMedian
All Wix sites3,07794%1.1s
Under 14 KB (First TCP window) 2.5%8795%1.1s
Over 75 KB 97.5%2,99094%1.1s
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
2

Initial HTML document size usage

Over 75 KB of HTML is the most used: 97.5% of Wix sites.

Over 75 KB 97.5%
Over 75 KB 97.5% Under 14 KB (First TCP window) 2.5%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
3

LCP phase breakdown by initial HTML document size

Median LCP phase breakdown (Chrome field p75) Load delay Median LCP
All Wix sites 2,353404 ms446 ms150 ms446 mslab 453 ms1.1s
Under 14 KB (First TCP window) 60404 ms390 ms123 ms151 ms390 mslab 402 ms1.1s
Over 75 KB 2,293404 ms448 ms150 ms448 mslab 455 ms1.1s
TTFB Resource load delay Resource load time Element render delay
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
4

Initial HTML document size per framework

React sets the initial HTML document size to over 75 KB of HTML on 97% of its sites, and 94% of React sites have a good LCP, against 94% of all sites.

FrameworkInitial HTML document size on its sitesGood LCP
All Wix sites 5,621 sitesOver 75 KB 98%94%
React 5,620 sitesOver 75 KB 97%94%
Over 75 KB Under 14 KB (First TCP window)
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
5

HTML document size or the framework

Does the framework explain the initial HTML document size difference?

Almost every site with over 75 KB of HTML initial HTML document size is a React site, and almost every React site has over 75 KB of HTML initial HTML document size, so the data can't tell over 75 KB of HTML initial HTML document size and React apart.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals HTTP protocol mix → HTTP protocol → ETag present → Cache strategy mix → By Arjen Karel · 5,621 crawled Wix sites (3,077 with phone Chrome field data, October 2026) · How we measured