The State of Web Vitals

JS libraries impact WordPress sites

Performance impact by framework provider.

Field data PhoneDesktopAll Scope All sites October 2026 edition · All devices field outcomes · WordPress sites only
Metric LCP INP CLS
WordPress Scoped to 63,295 sites out of 203,892 analyzed (cms) Compare with all sites →
1

At a glance the headline numbers for JS libraries impact

Performance impact by framework provider.

16
Providers ranked
After min-sites filter
120,717
Sites in sample
Combined across all items
0.02
Best CLS (p75)
Flickity
The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices field datacorewebvitals.io/state-of-cwv
2

The ranking sorted by CLS at p75, fastest first

# Provider CLS p75 Passing Sites
1 Flickity 0.02 91.1%
2,957
2 Vue.js 0.03 88.7%
4,844
3 Swiper 0.03 88.6%
17,874
4 jQuery 0.03 88.8%
60,315
5 GSAP 0.04 88.6%
3,245
6 Lit 0.04 86.1%
3,786
7 Stimulus/Hotwire 0.04 90.4%
53
8 Ionic 0.05 84.2%
58
9 Backbone.js 0.05 85.7%
1,041
10 Moment.js 0.05 85.0%
2,772
11 Slick Carousel 0.05 86.1%
5,156
12 Lazysizes 0.05 86.8%
5,715
13 Lodash 0.05 87.0%
9,344
14 Owl Carousel 0.06 84.4%
3,371
15 Angular 0.08 81.9%
86
16 React 0.09 78.1%
100
The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices field datacorewebvitals.io/state-of-cwv
3

Passing CLS per provider which group passes the CLS most often

ProviderSitesPassing CLSp75
Flickity 4.7% 2,957 91% 0.02
Stimulus/Hotwire 0.1% 53 90% 0.04
Ember.js 0.1% 49 90% 0.03
jQuery 95.3% 60,315 89% 0.03
Vue.js 7.7% 4,844 89% 0.03
Swiper 28.2% 17,874 89% 0.03
GSAP 5.1% 3,245 89% 0.04
Lodash 14.8% 9,344 87% 0.05
lazysizes 9% 5,715 87% 0.05
Slick Carousel 8.1% 5,156 86% 0.05
Lit 6% 3,786 86% 0.04
Backbone.js 1.6% 1,041 86% 0.05
Moment.js 4.4% 2,772 85% 0.05
Owl Carousel 5.3% 3,371 84% 0.06
Ionic 0.1% 58 84% 0.05
Polyfill.io 0% 18 82% 0.02
Angular 0.1% 86 82% 0.08
Next.js 0% 15 80% 0.10
React 0.2% 100 78% 0.09
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good CLS (0.1 at p75) · one value per site

91% of Flickity sites pass CLS. React trails 13 points behind. computed

The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices field datacorewebvitals.io/state-of-cwv
4

All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75

LCP
INP
CLS
FCP
TTFB
jQuery 95.3%
692.7s
98104ms
890.03
582.3s
301.9s
Swiper 28.2%
633.0s
98107ms
890.03
532.5s
282.0s
Lodash 14.8%
603.1s
98107ms
870.05
482.6s
232.2s
lazysizes 9%
672.8s
98106ms
870.05
572.4s
281.9s
Slick Carousel 8.1%
692.7s
98104ms
860.05
592.3s
321.8s
Vue.js 7.7%
682.8s
97124ms
890.03
582.3s
311.9s
Lit 6%
652.8s
98105ms
860.04
562.4s
311.8s
Owl Carousel 5.3%
652.8s
98105ms
840.06
562.4s
291.9s
GSAP 5.1%
633.0s
99106ms
890.04
542.5s
292.0s
Flickity 4.7%
662.8s
99108ms
910.02
552.4s
262.0s
Moment.js 4.4%
593.1s
98111ms
850.05
482.7s
252.1s
Backbone.js 1.6%
662.8s
98108ms
860.05
542.4s
301.9s
React 0.2%
632.8s
99117ms
780.09
522.3s
241.8s
Angular 0.1%
802.3s
96138ms
820.08
701.9s
491.4s
Ionic 0.1%
613.0s
100111ms
840.05
472.6s
281.9s
Stimulus/Hotwire 0.1%
652.7s
98117ms
900.04
642.5s
311.8s
Ember.js 0.1%
812.1s
93121ms
900.03
711.9s
521.4s
Polyfill.io 0%
593.4s
100109ms
820.02
413.0s
271.5s
Next.js 0%
872.2s
93146ms
800.10
801.6s
531.2s
60%95%+ passing Cell: pass rate, small number = p75 · faded rows: under 100 sites

One row per provider, one column per vital - the cell is the share of sites passing, the small number the p75. No toggling needed to see where the category actually differs.

Flickity leads on CLS: 91% of its sites pass. React trails at 78%. computed

The State of Web Vitals · October 2026 · WordPress sites (63,295) · all devices field datacorewebvitals.io/state-of-cwv
Related signals A/B testing (12) → Personalization (6) → E-commerce (17) → CDN (16) → 203,892 crawled sites with Chrome field data, representing millions of real page loads · How we measured