WordPress total page weight and the Core Web Vitals

Sites with under 1.2 MB of total page weight total page weight have a good LCP most often: 86%, against 70% of all WordPress sites. Sites with over 5 MB of total page weight page weight have it least often, at 61%.

2.5 to 5 MB of total page weight is the most used: 31.0% of WordPress sites. Under 1.2 MB of total page weight is 12.7% of WordPress sites.

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): 863 ms median for under 1.2 MB of total page weight against 1236 ms for over 5 MB of total page weight. Overall median field LCP is 1.5s for under 1.2 MB of total page weight (TTFB 863 ms, load delay 216 ms, load duration 127 ms, render delay 202 ms) versus 2.2s for over 5 MB of total page weight.

On jQuery, 32% of sites use 2.5 to 5 MB of total page weight total page weight, and 69% of jQuery sites have a good LCP, against 70% of all sites. On Vue, 34% of sites use over 5 MB of total page weight, and 68% of Vue sites have a good LCP.

FrameworkTotal page weight on its sitesGood LCP

All WordPress sites 63,295 sites2.5 to 5 MB total page 31%Over 5 MB total page 29%1.2 to 2.5 MB total page 27%Under 1.2 MB total page 13%70%

Alpine 380 sites2.5 to 5 MB total page 37%Over 5 MB total page 31%1.2 to 2.5 MB total page 24%80%

jQuery 60,314 sites2.5 to 5 MB total page 32%Over 5 MB total page 30%1.2 to 2.5 MB total page 27%Under 1.2 MB total page 12%69%

Vue 4,844 sitesOver 5 MB total page 34%2.5 to 5 MB total page 34%1.2 to 2.5 MB total page 25%68%

React 2,233 sitesOver 5 MB total page 40%2.5 to 5 MB total page 36%1.2 to 2.5 MB total page 20%61%

2.5 to 5 MB total page Over 5 MB total page 1.2 to 2.5 MB total page Under 1.2 MB total page

Does the framework explain the total page weight difference?

On jQuery, 85% of sites with under 1.2 MB of total page weight total page weight have a good LCP, against 67% of jQuery sites with 2.5 to 5 MB of total page weight. Within jQuery, sites with under 1.2 MB of total page weight have a good LCP more often. On Vue, 82% of sites with under 1.2 MB of total page weight total page weight have a good LCP, against 67% of Vue sites with 2.5 to 5 MB of total page weight. Within Vue, sites with under 1.2 MB of total page weight have a good LCP more often.

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 8,066 sites (12.7%) under 1.2 MB total transfer, 86% pass field LCP (1.5s median), falling to 61% (2.2s median) on the 29.3% (18,515) exceeding 5 MB.