The State of Web Vitals

Image formats on Wix sites

36.7% of audited sites (2,062) serve PNG images and 23.8% serve JPEG (92% good LCP), while 9.3% serve WebP (86% good LCP) and the 99.7% adopting AVIF reach 94% good LCP (1.2s 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 →

99.7% of Wix sites use AVIF images page image format mix, 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 · 5,333 with all devices field data · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
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LCP pass rate

Sites with AVIF images page image format mix have a good LCP most often: 94%, against 94% of all Wix sites. Sites with WebP images image formats have it least often, at 86%.

SitesGood, needs improvement, poor LCPMedian
All Wix sites5,33394%1.2s
AVIF images 99.7%5,31594%1.2s
GIF images / beacons 98.0%5,23094%1.2s
SVG vector graphics 69.1%3,69493%1.2s
Other image formats 16.4%88492%1.3s
PNG images 36.7%1,96792%1.2s
JPEG images 23.8%1,27292%1.3s
WebP images 9.3%49886%1.5s
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 · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
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Page image format mix usage

AVIF images is the most used: 99.7% of Wix sites.

Sites using each option (sites can use more than one) 5,619 sites
AVIF images 99.7% GIF images / beacons 98.0% SVG vector graphics 69.1% PNG images 36.7%
AVIF images 99.7% GIF images / beacons 98.0% SVG vector graphics 69.1% PNG images 36.7% JPEG images 23.8% Other image formats 16.4% WebP images 9.3%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
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LCP phase breakdown by image formats used on the page

Across the four LCP sub-parts in Chrome's field data, the largest gap between AVIF images and WebP images sits in time to first byte (TTFB): 419 ms median for AVIF images against 519 ms for WebP images. Overall median field LCP is 1.2s for AVIF images (TTFB 419 ms, load delay 455 ms, load duration 137 ms, render delay 151 ms) versus 1.5s for WebP images.

Median LCP phase breakdown (Chrome field p75) Load delay Median LCP
Wix sites with page image format mix 3,945419 ms455 ms455 mslab 455 ms1.2s
GIF images / beacons 3,868418 ms454 ms454 mslab 454 ms1.2s
AVIF images 3,941419 ms455 ms455 mslab 455 ms1.2s
PNG images 1,468427 ms455 ms155 ms455 mslab 455 ms1.2s
Other image formats 670467 ms459 ms153 ms459 mslab 459 ms1.3s
SVG vector graphics 2,783437 ms463 ms152 ms463 mslab 463 ms1.2s
JPEG images 941441 ms489 ms166 ms489 mslab 489 ms1.3s
WebP images 372519 ms525 ms184 ms525 mslab 525 ms1.5s
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 · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
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Page image format mix per framework

React sets the page image format mix to AVIF images on 100% of its sites, and 94% of React sites have a good LCP, against 94% of all sites.

FrameworkPage image format mix on its sitesGood LCP
Wix sites with page image format mix 5,619 sitesAVIF images 100%GIF images / beacons 98%SVG vector graphics 69%PNG images 37%JPEG images 24%Other image formats 16%94%
React 5,618 sitesAVIF images 100%GIF images / beacons 98%SVG vector graphics 69%PNG images 37%JPEG images 24%Other image formats 16%94%
AVIF images GIF images / beacons SVG vector graphics PNG images JPEG images Other image formats WebP images
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
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Image format mix or the framework

Does the framework explain the page image format mix difference?

Almost every site with AVIF images page image format mix is a React site, and almost every React site has AVIF images page image format mix, so the data can't tell AVIF images page image format mix and React apart.

How AVIF and WebP across the page cut transfer weight and free bandwidth for LCP

Even when the LCP element itself is optimized, legacy PNG and JPEG assets elsewhere in the viewport compete for bandwidth on the same connection. Across 5,603 sites (99.7%) serving AVIF images, 94% pass field LCP (1.2s median). WebP is present on 9.3% of sites (86% good LCP), whereas legacy PNG (36.7%, 92% good LCP) and JPEG (23.8%, 92% good LCP) remain on four out of five pages.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
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Understanding page image formats

Configure your image CDN or build pipeline to negotiate AVIF and WebP automatically via the Accept request header for every raster image on the page, reserving PNG and SVG strictly for logos and icons. Across all audited sites, 99.7% serve AVIF (94% good LCP, 1.2s median) and 9.3% serve WebP (86% good LCP).

Go fix it Optimize images for Core Web Vitals → JPEG XL and Core Web Vitals →
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 5,333 with all devices field data · 5,619 sites with page image format mixBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals Stylesheet origin (1P/3P) → Preloaded fonts → Stylesheet loading mix → Third-party share → By Arjen Karel · 5,621 crawled Wix sites (5,333 with all devices Chrome field data, 5,619 sites with page image format mix, October 2026) · How we measured