The State of Web Vitals

Subresource network protocols on Wix sites

HTTP/2 (100.0%), HTTP/3 QUIC (99.9%), and legacy HTTP/1.1 (99.9%) across all page subrequests: how connection protocols move Largest Contentful Paint.

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 →

100.0% of Wix sites use HTTP/2 subresource network protocols, 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
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LCP pass rate

Sites with HTTP/2 subresource network protocols have a good LCP most often: 94%, against 94% of all Wix sites. Sites with HTTP/1.1 network protocols have it least often, at 94%.

SitesGood, needs improvement, poor LCPMedian
All Wix sites3,07794%1.1s
HTTP/2 (h2) 100.0%3,07794%1.1s
HTTP/3 (QUIC / h3) 99.9%3,07694%1.1s
HTTP/1.1 99.9%3,07694%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
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Subresource network protocols usage

HTTP/2 is the most used: 100.0% of Wix sites.

Sites using each option (sites can use more than one) 5,621 sites
HTTP/2 (h2) 100.0% HTTP/3 (QUIC / h3) 99.9% HTTP/1.1 99.9%
HTTP/2 (h2) 100.0% HTTP/3 (QUIC / h3) 99.9% HTTP/1.1 99.9%
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
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How subresource network protocols affect the four LCP phases

Across the four LCP sub-parts in Chrome's field data, the largest gap between HTTP/2 and HTTP/1.1 sits in time to first byte (TTFB): 404 ms median for HTTP/2 against 404 ms for HTTP/1.1. Overall median field LCP is 1.1s for HTTP/2 (TTFB 404 ms, load delay 446 ms, load duration 110 ms, render delay 150 ms) versus 1.1s for HTTP/1.1.

Median LCP phase breakdown (Chrome field p75) Load delay Median LCP
All Wix sites 2,353404 ms446 ms150 ms446 mslab 453 ms1.1s
HTTP/2 (h2) 2,353404 ms446 ms150 ms446 mslab 453 ms1.1s
HTTP/3 (QUIC / h3) 2,353404 ms446 ms150 ms446 mslab 453 ms1.1s
HTTP/1.1 2,353404 ms446 ms150 ms446 mslab 453 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
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Subresource network protocols per framework

React sets the subresource network protocols to HTTP/2 on 100% of its sites, and 94% of React sites have a good LCP, against 94% of all sites.

FrameworkSubresource network protocols on its sitesGood LCP
All Wix sites 5,621 sitesHTTP/2 (h2) 100%HTTP/3 (QUIC / h3) 100%HTTP/1.1 100%94%
React 5,620 sitesHTTP/2 (h2) 100%HTTP/3 (QUIC / h3) 100%HTTP/1.1 100%94%
HTTP/2 (h2) HTTP/3 (QUIC / h3) HTTP/1.1
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
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Subresource network protocols or the framework

Does the framework explain the subresource network protocols difference?

Almost every site with HTTP/2 subresource network protocols is a React site, and almost every React site has HTTP/2 subresource network protocols, so the data can't tell HTTP/2 subresource network protocols and React apart.

Why most pages mix HTTP/2, HTTP/3, and HTTP/1.1 in a single load

While a page's HTML document uses a single connection, its subresources come from first-party CDNs, font hosts, and third-party scripts. Across 189,798 sites, 100.0% load subresources over HTTP/2 (94% good LCP), 99.9% negotiate HTTP/3 on at least one origin (94% good LCP), and 99.9% still make at least one legacy HTTP/1.1 request (94% good LCP).

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
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Understanding subresource network protocols

Serve all first-party static assets over HTTP/2 and HTTP/3 via a modern CDN, and audit third-party scripts or unproxied asset hosts that still fall back to HTTP/1.1 (99.9% of sites). HTTP/1.1 origins cannot multiplex concurrent requests over a single connection, adding head-of-line blocking when multiple assets share that domain.

Go fix it Third-party domains → Configure Cloudflare for passing the Core Web Vitals →
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 Connection hints → Main CDN → HTTP protocol → HTML compression → By Arjen Karel · 5,621 crawled Wix sites (3,077 with phone Chrome field data, October 2026) · How we measured