Total image payload on Wix sites

Sites with under 350 KB of images total image payload have a good LCP most often: 95%, against 94% of all Wix sites. Sites with over 3 MB of images image payload have it least often, at 92%.

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 over 3 MB of images sits in resource load delay: 411 ms median for under 350 KB of images against 541 ms for over 3 MB of images. Overall median field LCP is 1.1s for under 350 KB of images (TTFB 410 ms, load delay 411 ms, load duration 94 ms, render delay 153 ms) versus 1.3s for over 3 MB of images.

On React, 50% of sites use under 350 KB of images total image payload, and 94% of React sites have a good LCP, against 94% 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%94%

React 5,620 sitesUnder 350 KB 50%350 KB to 1 MB 34%1 MB to 3 MB 11%94%

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, 95% of sites with under 350 KB of images total image payload have a good LCP, against 94% 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, 95% pass field LCP at a 1.1s median, whereas the 5.3% (300) exceeding 3 MB drop to 92% good LCP (1.3s median).