Total page weight and the Core Web Vitals
25.2% of audited sites (53,132) keep total page transfer under 1.2 MB and pass LCP at 90% (1.2s median), compared with 75% (1.8s median) on the 23.1% exceeding 5 MB.
25.2% of sites use under 1.2 MB of total page weight total page weight, and 90% of those sites have a good LCP, against 82% of all sites.
LCP pass rate
Sites with under 1.2 MB of total page weight total page weight have a good LCP most often: 90%, against 82% of all sites. Sites with over 5 MB of total page weight page weight have it least often, at 75%.
Total page weight usage
1.2 to 2.5 MB of total page weight is the most used: 26.0% of sites. Under 1.2 MB of total page weight is 25.2% of sites.
The four LCP phases
Across the four LCP sub-parts in Chrome's field data, the largest gap between under 1.2 MB of total page weight and over 5 MB of total page weight sits in time to first byte (TTFB): 539 ms median for under 1.2 MB of total page weight against 735 ms for over 5 MB of total page weight. Overall median field LCP is 1.2s for under 1.2 MB of total page weight (TTFB 539 ms, load delay 219 ms, load duration 102 ms, render delay 189 ms) versus 1.8s for over 5 MB of total page weight.
Understanding total page weight
How total page weight compounds across cellular connections
Even with HTTP/2 and HTTP/3 multiplexing, transferring several megabytes of scripts, stylesheets, fonts, and images saturates mobile downlink bandwidth and delays critical rendering resources. Across 53,132 sites (25.2%) under 1.2 MB total transfer, 90% pass field LCP (1.2s median), falling to 75% (1.8s median) on the 23.1% (48,749) exceeding 5 MB.
Keep total initial page transfer under 2.5 MB by compressing media, lazy-loading below-the-fold assets, and pruning redundant third-party requests. Across all audited sites, 25.2% stay under 1.2 MB (90% good LCP, 1.2s median) versus 23.1% above 5 MB (75% good LCP, 1.8s median).
How total page weight plays out per platform
What the field data shows when you isolate a single CMS or framework.
WordPress 65,509 sites 60% of WordPress sites exceed 2.5 MB of total page weight (61% good LCP over 5 MB vs 86% under 1.2 MB, 25 points apart).
Across WordPress sites, 31% transfer 2.5 to 5 MB, 29% exceed 5 MB (61% LCP pass rate, 2.2s median), and 13% transfer under 1.2 MB (86% pass rate, 1.5s median).
Shopify 8,573 sites 81% of Shopify stores transfer over 2.5 MB total page weight.
Across Shopify storefronts, 47% transfer 2.5 to 5 MB (97% LCP pass rate, 1.3s median), 34% exceed 5 MB (93%, 1.5s median), and 18% transfer 1.2 to 2.5 MB (98%, 1.1s median).
React 9,570 sites React sites exceeding 5 MB of total transfer pass LCP 27 points less often than sites under 1.2 MB.
Across React sites, 14% transfer under 1.2 MB (96% LCP pass rate, 1.0s median), 42% transfer 1.2 to 2.5 MB (92%), and 20% exceed 5 MB (69% pass rate, 1.9s median).
Wix 5,825 sites 69% of Wix sites transfer under 2.5 MB of total network bytes.
Across Wix sites, 54% transfer 1.2 to 2.5 MB (96% LCP pass rate, 1.2s median), 15% transfer under 1.2 MB (98%, 952ms median), and 12% exceed 5 MB (91%).
By Arjen Karel · 210,902 crawled sites (196,263 with all devices Chrome field data, October 2026). How we measured.