Audio and video payload on Wix sites

Sites with under 500 KB of audio/video media audio and video payload have a good LCP most often: 95%, against 94% of all Wix sites. Sites with over 3 MB of audio/video media media payload have it least often, at 91%.

Sites with over 3 MB of audio/video media audio and video payload have a good INP most often: 98%, against 96% of all Wix sites. Sites with 500 KB to 3 MB of audio/video media media payload have it least often, at 93%.

No audio or video requests is the most used: 75.6% of Wix sites. Under 500 KB of audio/video media is 14.0% of Wix sites.

Across the four LCP sub-parts in Chrome's field data, the largest gap between under 500 KB of audio/video media and over 3 MB of audio/video media sits in resource load delay: 473 ms median for under 500 KB of audio/video media against 491 ms for over 3 MB of audio/video media. Overall median field LCP is 1.2s for under 500 KB of audio/video media (TTFB 402 ms, load delay 473 ms, load duration 114 ms, render delay 146 ms) versus 1.2s for over 3 MB of audio/video media.

Across the four LCP sub-parts in Chrome's field data, the largest gap between under 500 KB of audio/video media and over 3 MB of audio/video media sits in resource load delay: 473 ms median for under 500 KB of audio/video media against 491 ms for over 3 MB of audio/video media. Overall median field LCP is 1.2s for under 500 KB of audio/video media (TTFB 402 ms, load delay 473 ms, load duration 114 ms, render delay 146 ms) versus 1.2s for over 3 MB of audio/video media.

On React, 76% of sites use no audio or video requests audio and video payload, and 94% of React sites have a good LCP, against 94% of all sites.

On React, 76% of sites use no audio or video requests audio and video payload, and 96% of React sites have a good INP, against 96% of all sites.

FrameworkAudio and video payload on its sitesGood LCP

All Wix sites 5,621 sitesNo audio/video media 76%Light media (under 500 KB) 14%94%

React 5,620 sitesNo audio/video media 76%Light media (under 500 KB) 14%94%

No audio/video media Light media (under 500 KB) Heavy media (over 3 MB) Medium media (500 KB to 3 MB)

Does the framework explain the audio and video payload difference?

On React, 95% of sites with under 500 KB of audio/video media audio and video payload have a good LCP, against 94% of React sites with no audio or video requests. Within React, sites with under 500 KB of audio/video media and no audio or video requests have a good LCP about equally often.

On React, 98% of sites with over 3 MB of audio/video media audio and video payload have a good INP, against 96% of React sites with no audio or video requests. Within React, sites with over 3 MB of audio/video media and no audio or video requests have a good INP about equally often.

How autoplaying video streams saturate initial bandwidth

When a <video> tag loads without preload="none" or an optimized poster image, the browser fetches megabytes of video segments concurrently with critical stylesheets and hero assets. Across 4,251 sites (75.6%) with no initial media requests, 94% pass field LCP at a 1.1s median, versus 95% (1.2s median) under 500 KB and 91% (1.2s median) above 3 MB.