React site speed
How fast React websites load on a phone, from Google PageSpeed tests of 726 React sites, and which popular ones are slowest. Use it to benchmark your own site, or to find React sites that need speed work.
Real users: 22% of the 596 React sites with Chrome UX Report data are rated fast overall (good loading, responsiveness and layout stability).
Slowest popular React sites
Lowest mobile PageSpeed scores among React sites in the Tranco top million. One lab test each, so a score can move from day to day.
| Site | Industry | Mobile score | LCP | Page weight |
|---|---|---|---|---|
Acme Markets acmemarkets.com | Retail | 1 | 21.8s | 7.4 MB |
 Baltimore Symphony Orchestra bsomusic.org | – | 5 | 46.1s | 10.7 MB |
 Decathlon decathlon.com.au | – | 6 | 14.0s | 9.4 MB |
 Arby's arbys.com | Food service | 7 | 14.1s | 3.6 MB |
 Golfballs golfballs.com | – | 7 | 20.3s | 5.5 MB |
 Eldan Transportation eldan.co.il | – | 7 | 16.6s | 2.9 MB |
Cia.Marítima: Sua loja de moda praia ciamaritima.com.br | – | 7 | 21.5s | 6.4 MB |
 Ascension ascension.org | Health care | 8 | 37.4s | 19.1 MB |
 El Mundo del Juguete elmundodeljuguete.com.ar | – | 14 | 7.1s | 3.5 MB |
 Meril Life Sciences (India) merillife.com | – | 15 | 13.6s | 14.5 MB |
 Boston Herald bostonherald.com | – | 16 | 32.8s | 12.4 MB |
 Brilliant brilliant.org | – | 16 | 11.8s | 9.7 MB |
 Andreani Grupo Logístico andreani.com | 16 | 18.3s | 3.7 MB | |
Asdeporte asdeporte.com | – | 18 | 28.1s | 10.3 MB |
 Cree cree.com | – | 18 | 20.4s | 3.9 MB |
 edX edx.org | Educational system | 19 | 30.7s | 5.2 MB |
7-Eleven 7-eleven.com | Retail | 19 | 13.6s | 8.2 MB |
 80 80.lv | – | 19 | 38.0s | 11.1 MB |
Brillux brillux.de | – | 19 | 20.3s | 33.6 MB |
Agilità agilitafashion.com.br | – | 20 | 26.7s | 4.6 MB |
 Amway amway.in | Cosmetics | 21 | 16.7s | 6.3 MB |
 Australian Broadcasting Corporation abc.net.au | Broadcasting | 22 | 16.3s | 5.8 MB |
 American Art Therapy Association arttherapy.org | – | 22 | 11.1s | 6.6 MB |
 CertiProf certiprof.com | – | 24 | 13.8s | 4.7 MB |
 J.Crew jcrew.com | Retail | 26 | 21.3s | 10.7 MB |
Every slow React site, as a list
All React sites scoring under 50 on mobile, filtered by industry, country or popularity, with what slows each one down, company details and contacts. Credits included to start.
Third parties React sites load most
- Google Tag Manager75%
- Google Analytics59%
- Google/Doubleclick Ads54%
- Other Google APIs/SDKs43%
- Facebook30%
- Google Fonts30%
- Bing Ads25%
- Clarity21%
- Sentry18%
- LinkedIn Ads16%
Fastest popular React sites
- Abelha Rainha abelharainha.com.br100
- Axon Enterprise axon.com96
- CoverMyMeds covermymeds.com94
- Cosmetology.co.za cosmetology.co.za94
- Exodus Wallet exodus.com92
- ChopChop chopchop.se91
- Idealo idealo.com86
- Doctrine doctrine.fr86
- Procter and Gamble (Thailand) pg.com84
- Arsenal F.C. arsenal.com82
How this is measured
Each site's home page is tested with Google PageSpeed Insights (Lighthouse, simulated mid-range phone on a slow 4G connection) when it's enriched; real-user ratings come from the Chrome UX Report where Google has enough visits. Only sites in the Tranco top million are named. See also websites using React. Updated October 2026.
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