The State of Web Vitals

Main-thread CPU breakdown on Wix sites

21.6% of audited sites (1,216) spend over 1,200ms in main-thread scripting during load, pushing median field INP to 87ms (95% good INP) versus 72ms (97% good INP) at 150 to 450ms.

Field data PhoneDesktopAll Scope All sites October 2026 edition · Phone field outcomes · Wix sites only
Wix Scoped to 5,623 sites out of 203,892 analyzed (cms) Compare with all sites →

32.2% of Wix sites use 150 to 450ms of scripting CPU main-thread CPU breakdown, and 97% of those sites have a good INP, against 96% of all Wix sites.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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INP pass rate

Sites with 150 to 450ms of scripting CPU main-thread CPU breakdown have a good INP most often: 97%, against 96% of all Wix sites. Sites with over 1,200ms of scripting CPU scripting CPU have it least often, at 95%.

SitesGood, needs improvement, poor INPMedian
All Wix sites3,07796%79ms
Under 150ms scripting CPU 2.1%5497%83ms
150 to 450ms scripting CPU 32.2%99997%72ms
450 to 1,200ms scripting CPU 44.1%1,37296%80ms
Over 1,200ms scripting CPU 21.6%65295%87ms
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Main-thread CPU breakdown usage

450 to 1,200ms of scripting CPU is the most used: 44.1% of Wix sites. 150 to 450ms of scripting CPU is 32.2% of Wix sites.

450 to 1,200ms scripting CPU 44.1% 150 to 450ms scripting CPU 32.2% Over 1,200ms scripting CPU 21.6%
450 to 1,200ms scripting CPU 44.1% 150 to 450ms scripting CPU 32.2% Over 1,200ms scripting CPU 21.6% Under 150ms scripting CPU 2.1%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Main-thread CPU breakdown per framework

On React, 44% of sites use 450 to 1,200ms of scripting CPU main-thread CPU breakdown, and 96% of React sites have a good INP, against 96% 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%96%
React 5,620 sites450 to 1,200ms scripting CPU 44%150 to 450ms scripting CPU 32%Over 1,200ms scripting CPU 22%96%
450 to 1,200ms scripting CPU 150 to 450ms scripting CPU Over 1,200ms scripting CPU Under 150ms scripting CPU
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Main-thread CPU breakdown or the framework

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

On React, 97% of sites with 150 to 450ms of scripting CPU main-thread CPU breakdown have a good INP, against 96% of React sites with 450 to 1,200ms of scripting CPU. Within React, sites with 150 to 450ms of scripting CPU and 450 to 1,200ms 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, 97% pass field INP (72ms median), while the 21.6% (1,216) exceeding 1,200ms drop to 95% good INP (87ms median).

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Understanding main-thread CPU breakdown

Audit scripts consuming over 450ms of CPU during boot and yield between hydration, analytics initialization, and DOM manipulation. Across all audited sites, 32.2% spend 150 to 450ms in scripting CPU (97% good INP, 72ms median) versus 21.6% above 1,200ms (95% good INP, 87ms median).

Go fix it Yield to the main thread → Fix excessive DOM size → JavaScript priority levels →
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 3,077 with phone field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals Document lifecycle (lab) → Lab paint timeline → Total Blocking Time (lab) → By Arjen Karel · 5,621 crawled Wix sites (3,077 with phone Chrome field data, October 2026) · How we measured