Gatsby site speed
How fast Gatsby websites load on a phone, from Google PageSpeed tests of 33 Gatsby sites, and which popular ones are slowest. Use it to benchmark your own site, or to find Gatsby sites that need speed work.
Real users: 27% of the 30 Gatsby sites with Chrome UX Report data are rated fast overall (good loading, responsiveness and layout stability).
Slowest popular Gatsby sites
Lowest mobile PageSpeed scores among Gatsby 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 |
|---|---|---|---|---|
 Affirm affirm.com | Fintech | 14 | 20.9s | 6.6 MB |
 Mason getmason.io | – | 15 | 9.2s | 2.9 MB |
 Cree cree.com | – | 18 | 20.4s | 3.9 MB |
 Hoffmann-La Roche roche.com | Pharmaceutical | 22 | 12.5s | 1.9 MB |
 PostHog posthog.com | – | 23 | 30.2s | 6.3 MB |
 Inter bancointer.com.br | – | 26 | 22.3s | 9.7 MB |
 Biesse biesse.com | – | 35 | 22.4s | 36.3 MB |
 Andersen andersenlab.com | Custom software | 36 | 9.1s | 2.8 MB |
 Forest Green Rovers F.C. fgr.co.uk | – | 40 | 23.3s | 6.7 MB |
 BabyBjörn babybjorn.com | – | 41 | 19.4s | 4.9 MB |
 UiPath uipath.com | Software | 47 | 17.2s | 5.7 MB |
 Bmigroup bmigroup.com | – | 55 | 17.3s | 6.3 MB |
.png){kind=small} APCO apcoworldwide.com | Public relations | 55 | 26.6s | 4.4 MB |
 Aha! aha.io | Software | 56 | 12.6s | 1.5 MB |
 Credera credera.com | – | 58 | 19.7s | 4.6 MB |
 BroadwayWorld broadwayworld.com | – | 59 | 4.8s | 4.2 MB |
 Borrowell borrowell.com | – | 62 | 4.4s | 1.9 MB |
Aleo: Private Stablecoin Payments aleo.org | – | 69 | 9.1s | 1.5 MB |
 Anticimex anticimex.se | – | 82 | 2.5s | 2.3 MB |
 Australian Christian College – Singleton acc.edu.au | – | 94 | 1.4s | 1.0 MB |
Every slow Gatsby site, as a list
All Gatsby 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 Gatsby sites load most
- Google Tag Manager91%
- Google/Doubleclick Ads73%
- Google Analytics67%
- Other Google APIs/SDKs55%
- Google Fonts39%
- Clarity33%
- Bing Ads33%
- Facebook33%
- ctfassets.net21%
- LinkedIn Ads21%
Fastest popular Gatsby sites
- Australian Christian College – Singleton acc.edu.au94
- Anticimex anticimex.se82
- Aleo: Private Stablecoin Payments aleo.org69
- Borrowell borrowell.com62
- BroadwayWorld broadwayworld.com59
- Credera credera.com58
- Aha! aha.io56
- Bmigroup bmigroup.com55
- APCO apcoworldwide.com55
- UiPath uipath.com47
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 Gatsby. Updated October 2026.
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