BigCommerce themes ranked by mobile speed

As of September 2026 (measured 2026-09-15), the fastest BigCommerce theme on mobile is Cornerstone Bold by BigCommerce, with a Google Lighthouse speed score of 86 out of 100, followed by Cornerstone Warm by BigCommerce at 85 and Artify Electronics at 82. 239 BigCommerce themes were tested on their own demo stores; the ranking above is live and changes as themes are re-tested.

On desktop, Cornerstone Warm by BigCommerce has the highest speed score in September 2026 at 99 out of 100, then Cornerstone Bold at 98. 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 BigCommerce themes, Cornerstone Bold by BigCommerce has the highest mobile speed score in September 2026 at 86 out of 100; Cornerstone Warm is next at 85. 12 of the 239 tested BigCommerce themes are free; the full list is at /bigcommerce/free.

The most popular BigCommerce theme by marketplace usage is Revo by magentech, and in September 2026 it scores 45 out of 100 for mobile speed, against 86 for the fastest theme, Cornerstone Bold. Kido (64) and TopDeal (60) are the next most popular. Popularity is a signal of trust, not of speed.

In September 2026, the median mobile Lighthouse performance score across 239 tested BigCommerce themes is 61 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, Capacity Bright by BigCommerce has the fastest Largest Contentful Paint among tested BigCommerce themes: 2.6 s LCP on mobile with a Cumulative Layout Shift of 0.489. Google's thresholds are 2.5 s for LCP and 0.1 for CLS; every theme's page lists its vitals per device.

Revo by magentech scores 45 out of 100 for mobile speed and 70 on desktop in September 2026, measured with Google Lighthouse on its demo store. That places it at number 223 of 239 tested BigCommerce themes. Its page at /theme/bigcommerce/tf-revo-multipurpose-stencil-responsive-bigcommerce-theme-21591378 shows every page, preset and the audits behind the number.

Cornerstone Bold by BigCommerce scores 86 out of 100 for mobile speed and 98 on desktop in September 2026, measured with Google Lighthouse on its demo store. That places it first of 239 tested BigCommerce themes. Its page at /theme/bigcommerce/cornerstone-bold shows every page, preset and the audits behind the number.

In September 2026, Cornerstone Bold scores 86 and Cornerstone Warm scores 85 for mobile speed; on desktop it is 98 against 99. Two points is inside Lighthouse's run-to-run variation, so treat them as level on this measure. Pick both in the rankings and press Compare for every score side by side.

Among vendors with two or more tested BigCommerce themes, Epic Design Labs has the highest median mobile speed score in September 2026: 72 across 3 themes. Vendor pages list every theme a vendor has on the rankings.

239 BigCommerce 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.