The State of Web Vitals

Total Blocking Time (TBT) on Wix sites

37.2% of audited sites (2,093) record 0ms of lab Total Blocking Time (99% good field INP, 34ms median) and 44.2% stay within 1 to 200ms (100% good INP), while the 7.7% exceeding 600ms TBT drop to 100% good INP (44ms median).

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

37.2% of Wix sites have no lab Total Blocking Time (TBT). Of the 62.8% that do, 70% use 1 to 200ms TBT, and 100% of those sites have a good INP, against 100% of all Wix sites.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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INP pass rate

Sites with 1 to 200ms TBT lab Total Blocking Time (TBT) have a good INP most often: 100%, against 100% of all Wix sites.

SitesGood, needs improvement, poor INPMedian
All Wix sites728100%37ms
1ms to 200ms TBT (Good) 44.2%341100%39ms
201ms to 600ms TBT (Needs Improvement) 10.9%91100%45ms
Over 600ms TBT (Poor) 7.7%63100%44ms
0ms TBT (Zero long tasks) 37.2%23399%34ms
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Lab Total Blocking Time (TBT) usage

62.8% of Wix sites use lab Total Blocking Time (TBT), and 70% of those use 1 to 200ms TBT.

All Wix sites 5,621 sites
0ms TBT (Zero long tasks) 37.2% Lab Total Blocking Time (TBT) 62.8%
Sites with lab Total Blocking Time (TBT) 3,528 sites
1ms to 200ms TBT (Good) 70.5% 201ms to 600ms TBT (Needs Improvement) 17.3% Over 600ms TBT (Poor) 12.2%
1ms to 200ms TBT (Good) 70.5% 201ms to 600ms TBT (Needs Improvement) 17.3% Over 600ms TBT (Poor) 12.2%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Lab Total Blocking Time (TBT) per framework

On React, 44% of sites use 1 to 200ms TBT lab Total Blocking Time (TBT), and 100% of React sites have a good INP, against 100% of all sites.

FrameworkLab Total Blocking Time (TBT) on its sitesGood INP
All Wix sites 5,621 sites1ms to 200ms TBT (Good) 44%0ms TBT (Zero long tasks) 37%201ms to 600ms TBT (Needs Improvement) 11%100%
React 5,620 sites1ms to 200ms TBT (Good) 44%0ms TBT (Zero long tasks) 37%201ms to 600ms TBT (Needs Improvement) 11%100%
1ms to 200ms TBT (Good) 0ms TBT (Zero long tasks) 201ms to 600ms TBT (Needs Improvement) Over 600ms TBT (Poor)
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Total Blocking Time or the framework

Does the framework explain the lab Total Blocking Time (TBT) difference?

On React, 100% of sites with 1 to 200ms TBT lab Total Blocking Time (TBT) have a good INP, against 99% of React sites with 0ms TBT. Within React, sites with 1 to 200ms TBT and 0ms TBT have a good INP about equally often.

How lab Total Blocking Time translates into field INP responsiveness

Total Blocking Time sums the blocking portion (anything past 50ms) of every long main-thread task during lab page load. Across 2,093 sites (37.2%) with 0ms TBT and 2,487 sites (44.2%) within 1 to 200ms TBT, 99% and 100% pass field INP (34ms and 39ms median). When lab TBT rises to 201 to 600ms (10.9%), good INP dips to 100% (45ms median), and past 600ms TBT (7.7%, 431 sites) good INP falls to 100% (44ms median).

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
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Understanding Total Blocking Time (TBT)

Keep lab Total Blocking Time under 200ms by code-splitting large bundles, deferring non-critical third-party tags until after first interaction, and yielding to the main thread via scheduler.yield() between startup tasks. Across all audited sites, 44.2% sit at 1 to 200ms TBT (100% good INP) while 7.7% exceed 600ms (100% good INP).

Go fix it Yield to the main thread → 14 methods to defer JavaScript → Interaction to Next Paint →
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field dataBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals Main-thread CPU (lab) → Lab paint timeline → Document lifecycle (lab) → By Arjen Karel · 5,621 crawled Wix sites (728 with desktop Chrome field data, October 2026) · How we measured