Squarespace themes ranked by mobile speed

As of September 2026 (measured 2026-09-15), the fastest Squarespace theme on mobile is Clune by Squarespace, with a Google Lighthouse speed score of 78 out of 100, followed by Pazari by Squarespace at 70 and Just My Type at 67. 45 Squarespace themes were tested on their own demo stores; the ranking above is live and changes as themes are re-tested.

On desktop, Hart by Squarespace has the highest speed score in September 2026 at 97 out of 100, then Clune at 96. Desktop scores run higher than mobile for the same theme because Lighthouse's mobile test simulates a mid-range phone on a slow 4G connection; mobile is the score Google ranks by.

Among free Squarespace themes, Clune by Squarespace has the highest mobile speed score in September 2026 at 78 out of 100; Pazari is next at 70. 45 of the 45 tested Squarespace themes are free; the full list is at /squarespace/free.

In September 2026, the median mobile Lighthouse performance score across 45 tested Squarespace themes is 55 out of 100, and 0 (0%) reach Google's "good" band of 90 or better. Google's bands are 90–100 good, 50–89 needs improvement and 0–49 poor.

On its demo store's home page in September 2026, Clune by Squarespace has the fastest Largest Contentful Paint among tested Squarespace themes: 4.6 s LCP on mobile with a Cumulative Layout Shift of 0.000. Google's thresholds are 2.5 s for LCP and 0.1 for CLS; every theme's page lists its vitals per device.

Clune by Squarespace scores 78 out of 100 for mobile speed and 96 on desktop in September 2026, measured with Google Lighthouse on its demo store. That places it first of 45 tested Squarespace themes. Its page at /theme/squarespace/clune-fluid-demo shows every page, preset and the audits behind the number.

In September 2026, Clune scores 78 and Pazari scores 70 for mobile speed; on desktop it is 96 against 93. Clune leads by 8 points. Pick both in the rankings and press Compare for every score side by side.

Among vendors with two or more tested Squarespace themes, Squarespace has the highest median mobile speed score in September 2026: 55 across 45 themes. Vendor pages list every theme a vendor has on the rankings.

45 Squarespace themes have Lighthouse scores as of 2026-09-15. Every theme is re-tested on a schedule set by its popularity — the most used every week, the long tail every one to two months — and every run is kept, so a theme's page shows its history. New themes are picked up from the marketplaces daily.

Yes. Page speed is part of Google's ranking systems through Core Web Vitals, and slower pages convert fewer visitors. The theme sets the floor: apps, images and tracking scripts only add to what it loads. A theme that scores 90 or better on mobile on its own demo leaves room for a real store; one that scores 50 on an empty demo has none. Test your own store at /test-my-store.

Each theme's own demo store is run through Google's PageSpeed Insights API (Lighthouse) on a simulated mobile phone and on desktop, for the home page and, on store platforms, a collection page and a product page. A theme's score is the median of its presets; a preset's is the mean of its pages. Dead, password-protected and cloaked demos are excluded before they can score. The full method is at /methodology.