Audio and video payload on Wix sites

Sites with no audio or video requests audio and video payload have a good LCP most often: 94%, against 94% of all Wix sites. Sites with 500 KB to 3 MB of audio/video media media payload have it least often, at 92%.

Sites with over 3 MB of audio/video media audio and video payload have a good INP most often: 98%, against 97% of all Wix sites. Sites with 500 KB to 3 MB of audio/video media media payload have it least often, at 96%.

No audio or video requests is the most used: 75.6% of Wix sites.

Across the four LCP sub-parts in Chrome's field data, the largest gap between no audio or video requests and 500 KB to 3 MB of audio/video media sits in resource load delay: 445 ms median for no audio or video requests against 509 ms for 500 KB to 3 MB of audio/video media. Overall median field LCP is 1.2s for no audio or video requests (TTFB 417 ms, load delay 445 ms, load duration 137 ms, render delay 152 ms) versus 1.3s for 500 KB to 3 MB of audio/video media.

Across the four LCP sub-parts in Chrome's field data, the largest gap between no audio or video requests and 500 KB to 3 MB of audio/video media sits in resource load delay: 445 ms median for no audio or video requests against 509 ms for 500 KB to 3 MB of audio/video media. Overall median field LCP is 1.2s for no audio or video requests (TTFB 417 ms, load delay 445 ms, load duration 137 ms, render delay 152 ms) versus 1.3s for 500 KB to 3 MB of audio/video media.

React sets the audio and video payload to no audio or video requests on 76% of its sites, and 94% of React sites have a good LCP, against 94% of all sites.

React sets the audio and video payload to no audio or video requests on 76% of its sites, and 97% of React sites have a good INP, against 97% 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, 94% of sites with no audio or video requests audio and video payload have a good LCP, against 94% of React sites with under 500 KB of audio/video media. Within React, sites with no audio or video requests and under 500 KB of audio/video media 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 97% 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 1.2s median, versus 94% (1.2s median) under 500 KB and 93% (1.3s median) above 3 MB.