Total image payload on Wix sites

Sites with under 350 KB of images total image payload have a good LCP most often: 94%, against 92% of all Wix sites. Sites with 1 MB to 3 MB of images image payload have it least often, at 91%.

Under 350 KB of images is the most used: 49.5% of Wix sites.

Across the four LCP sub-parts in Chrome's field data, the largest gap between under 350 KB of images and 1 MB to 3 MB of images sits in resource load delay: 444 ms median for under 350 KB of images against 531 ms for 1 MB to 3 MB of images. Overall median field LCP is 1.1s for under 350 KB of images (TTFB 330 ms, load delay 444 ms, load duration 237 ms, render delay 137 ms) versus 1.3s for 1 MB to 3 MB of images.

On React, 50% of sites use under 350 KB of images total image payload, and 92% of React sites have a good LCP, against 92% of all sites.

FrameworkTotal image payload on its sitesGood LCP

All Wix sites 5,621 sitesUnder 350 KB 50%350 KB to 1 MB 34%1 MB to 3 MB 11%92%

React 5,620 sitesUnder 350 KB 50%350 KB to 1 MB 34%1 MB to 3 MB 11%92%

Under 350 KB 350 KB to 1 MB 1 MB to 3 MB Over 3 MB

Does the framework explain the total image payload difference?

On React, 94% of sites with under 350 KB of images total image payload have a good LCP, against 92% of React sites with 350 KB to 1 MB of images. Within React, sites with under 350 KB of images and 350 KB to 1 MB of images have a good LCP about equally often.

How total image weight competes with the hero paint

Even when off-screen images are lazy-loaded, oversized carousels, unresized product grids, and CSS background images compete for cellular bandwidth during initial viewport load. Across 2,785 sites (49.5%) under 350 KB of images, 94% pass field LCP at a 1.1s median, whereas the 5.3% (300) exceeding 3 MB drop to 87% good LCP (1.4s median).