Main-thread CPU breakdown on Wix sites

Sites with 450 to 1,200ms of scripting CPU main-thread CPU breakdown have a good INP most often: 100%, against 100% of all Wix sites. Sites with 150 to 450ms of scripting CPU scripting CPU have it least often, at 99%.

450 to 1,200ms of scripting CPU is the most used: 44.1% of Wix sites.

On React, 44% of sites use 450 to 1,200ms of scripting CPU main-thread CPU breakdown, and 100% of React sites have a good INP, against 100% of all sites.

FrameworkMain-thread CPU breakdown on its sitesGood INP

All Wix sites 5,621 sites450 to 1,200ms scripting CPU 44%150 to 450ms scripting CPU 32%Over 1,200ms scripting CPU 22%100%

React 5,620 sites450 to 1,200ms scripting CPU 44%150 to 450ms scripting CPU 32%Over 1,200ms scripting CPU 22%100%

450 to 1,200ms scripting CPU 150 to 450ms scripting CPU Over 1,200ms scripting CPU Under 150ms scripting CPU

Does the framework explain the main-thread CPU breakdown difference?

On React, 100% of sites with 450 to 1,200ms of scripting CPU main-thread CPU breakdown have a good INP, against 99% of React sites with 150 to 450ms of scripting CPU. Within React, sites with 450 to 1,200ms of scripting CPU and 150 to 450ms of scripting CPU have a good INP about equally often.

Why scripting dominates main-thread CPU budgets

Across the web, JavaScript evaluation accounts for the largest share of total main-thread CPU time, dwarfing HTML parsing, style calculation, and painting. Across 1,810 sites (32.2%) spending 150 to 450ms in scripting CPU, 99% pass field INP (32ms median), while the 21.6% (1,216) exceeding 1,200ms drop to 100% good INP (44ms median).