Audio and video payload and the Core Web Vitals

Sites with over 3 MB of audio/video media audio and video payload have a good LCP most often: 87%, against 86% of all sites. Sites with under 500 KB of audio/video media media payload have it least often, at 85%.

Sites with under 500 KB of audio/video media audio and video payload have a good INP most often: 99%, against 99% of all sites. Sites with over 3 MB of audio/video media media payload have it least often, at 99%.

No audio or video requests is the most used: 90.5% of sites. Over 3 MB of audio/video media is 2.3% of sites.

Across the four LCP sub-parts in Chrome's field data, the largest gap between over 3 MB of audio/video media and under 500 KB of audio/video media sits in time to first byte (TTFB): 520 ms median for over 3 MB of audio/video media against 590 ms for under 500 KB of audio/video media. Overall median field LCP is 1.5s for over 3 MB of audio/video media (TTFB 520 ms, load delay 335 ms, load duration 133 ms, render delay 223 ms) versus 1.5s for under 500 KB of audio/video media.

Across the four LCP sub-parts in Chrome's field data, the largest gap between over 3 MB of audio/video media and under 500 KB of audio/video media sits in time to first byte (TTFB): 520 ms median for over 3 MB of audio/video media against 590 ms for under 500 KB of audio/video media. Overall median field LCP is 1.5s for over 3 MB of audio/video media (TTFB 520 ms, load delay 335 ms, load duration 133 ms, render delay 223 ms) versus 1.5s for under 500 KB of audio/video media.

On WordPress, 88% of sites use no audio or video requests audio and video payload, and 76% of WordPress sites have a good LCP, against 86% of all sites. On Shopify, 78% of sites use no audio or video requests, and 97% of Shopify sites have a good LCP.

On WordPress, 88% of sites use no audio or video requests audio and video payload, and 100% of WordPress sites have a good INP, against 99% of all sites. On Shopify, 78% of sites use no audio or video requests, and 99% of Shopify sites have a good INP.

PlatformAudio and video payload on its sitesGood LCP

All sites 212,308 sitesNo audio/video media 90%86%

Shopify 8,634 sitesNo audio/video media 78%Light media (under 500 KB) 12%97%

Squarespace 2,275 sitesNo audio/video media 99%94%

Drupal 3,322 sitesNo audio/video media 93%93%

Joomla 2,569 sitesNo audio/video media 92%93%

Wix 5,873 sitesNo audio/video media 76%Light media (under 500 KB) 14%92%

Adobe Commerce 1,102 sitesNo audio/video media 91%83%

WordPress 65,939 sitesNo audio/video media 88%76%

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

Does the platform explain the audio and video payload difference?

On WordPress, 76% of sites with over 3 MB of audio/video media audio and video payload have a good LCP, against 76% of WordPress sites with no audio or video requests. Within WordPress, sites with over 3 MB of audio/video media and no audio or video requests have a good LCP about equally often. On Shopify, 97% of sites with over 3 MB of audio/video media audio and video payload have a good LCP, against 97% of Shopify sites with no audio or video requests. Within Shopify, sites with over 3 MB of audio/video media and no audio or video requests have a good LCP about equally often.

On WordPress, 100% of sites with under 500 KB of audio/video media audio and video payload have a good INP, against 100% of WordPress sites with no audio or video requests. Within WordPress, sites with under 500 KB of audio/video media and no audio or video requests have a good INP about equally often. On Shopify, 99% of sites with under 500 KB of audio/video media audio and video payload have a good INP, against 100% of Shopify sites with no audio or video requests. Within Shopify, sites with under 500 KB 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 192,128 sites (90.5%) with no initial media requests, 86% pass field LCP at a 1.4s median, versus 85% (1.5s median) under 500 KB and 87% (1.5s median) above 3 MB.