The State of Web Vitals

JS libraries impact WordPress sites

Performance impact by framework provider.

Field data PhoneDesktopAll Scope All sites October 2026 edition · Phone 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
0.01
Best CLS (p75)
Flickity
The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone field datacorewebvitals.io/state-of-cwv
2

The ranking sorted by CLS at p75, fastest first

# Provider CLS p75 Passing Sites
1 Flickity 0.01 93.2%
2,957
2 jQuery 0.01 90.2%
60,315
3 Lit 0.02 87.2%
3,786
4 Vue.js 0.02 89.9%
4,844
5 Slick Carousel 0.02 88.4%
5,156
6 Lazysizes 0.02 89.0%
5,715
7 Lodash 0.02 89.3%
9,344
8 Swiper 0.02 89.5%
17,874
9 GSAP 0.03 88.3%
3,245
10 Stimulus/Hotwire 0.03 92.3%
53
11 Backbone.js 0.03 86.4%
1,041
12 Moment.js 0.03 87.6%
2,772
13 Owl Carousel 0.03 86.3%
3,371
14 React 0.06 86.4%
100
15 Ionic 0.07 79.4%
58
16 Angular 0.07 87.1%
86
The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone 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 93% 0.01
Stimulus/Hotwire 0.1% 53 92% 0.03
Ember.js 0.1% 49 92% 0.01
Next.js 0% 15 91% 0.09
jQuery 95.3% 60,315 90% 0.01
Polyfill.io 0% 18 90% 0.00
Vue.js 7.7% 4,844 90% 0.02
Swiper 28.2% 17,874 90% 0.02
Lodash 14.8% 9,344 89% 0.02
lazysizes 9% 5,715 89% 0.02
Slick Carousel 8.1% 5,156 88% 0.02
GSAP 5.1% 3,245 88% 0.03
Moment.js 4.4% 2,772 88% 0.03
Lit 6% 3,786 87% 0.02
Angular 0.1% 86 87% 0.07
Backbone.js 1.6% 1,041 86% 0.03
React 0.2% 100 86% 0.06
Owl Carousel 5.3% 3,371 86% 0.03
Ionic 0.1% 58 79% 0.07
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

93% of Flickity sites pass CLS. Owl Carousel trails 7 points behind. computed

The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone 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
97119ms
900.01
572.3s
311.8s
Swiper 28.2%
633.0s
96122ms
900.02
532.5s
302.0s
Lodash 14.8%
613.0s
96124ms
890.02
492.6s
252.1s
lazysizes 9%
672.8s
96122ms
890.02
572.3s
301.8s
Slick Carousel 8.1%
672.8s
97122ms
880.02
562.4s
321.8s
Vue.js 7.7%
672.8s
95137ms
900.02
562.3s
311.9s
Lit 6%
632.9s
97122ms
870.02
532.4s
301.8s
Owl Carousel 5.3%
642.9s
97120ms
860.03
552.4s
291.8s
GSAP 5.1%
633.0s
97121ms
880.03
542.5s
311.9s
Flickity 4.7%
672.8s
97124ms
930.01
562.4s
281.9s
Moment.js 4.4%
603.0s
96126ms
880.03
492.6s
262.1s
Backbone.js 1.6%
652.8s
95127ms
860.03
522.5s
291.9s
React 0.2%
682.7s
93143ms
860.06
532.1s
361.5s
Angular 0.1%
842.3s
93154ms
870.07
691.9s
491.4s
Ionic 0.1%
583.0s
100135ms
790.07
352.5s
251.9s
Stimulus/Hotwire 0.1%
682.6s
97124ms
920.03
642.5s
431.5s
Ember.js 0.1%
832.0s
87146ms
920.01
781.8s
531.3s
Polyfill.io 0%
703.4s
100122ms
900.00
303.3s
251.5s
Next.js 0%
912.4s
91149ms
910.09
821.7s
551.2s
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: 93% of its sites pass. React trails at 86%. computed

The State of Web Vitals · October 2026 · WordPress sites (63,295) · phone 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