themestestedbyWhirlwind eCommerceWhirlwind eCommerce

As of 2026-09-14, 12 BigCommerce themes have been tested with Google Lighthouse on their own demo stores; 0 (0%) score 90 or better for mobile speed. The highest is Cornerstone Bold by BigCommerce at 86, then Cornerstone Light by BigCommerce at 82, and Cornerstone Warm by BigCommerce at 79.

Free BigCommerce themes ranked by speed

Fastest themes on mobile
Each row shows six scores — speed, SEO and accessibility, measured on mobile, then the same three on desktop. 90good 50needs work 30poor –not measured Hover any score for what it measures. Bands are Lighthouse's own: 90+, 50–89, under 50.
Presets MobileDesktop

Questions people ask

What is the fastest BigCommerce theme in 2026?

On 2026-09-14, the highest mobile speed score among the 12 BigCommerce themes we have tested is Cornerstone Bold by BigCommerce at 86 out of 100, measured with Google Lighthouse on its demo store. Rankings change as themes are re-tested, so the live table above is the current answer.

How are BigCommerce themes tested?

Each theme's own demo store is run through Google's PageSpeed Insights API (Lighthouse) on mobile and desktop, for the home page and, where the platform has them, a collection page and a product page. A theme's headline score is the median of its presets; a preset's is the mean of its pages. Every run is kept, so scores have a history and are re-measured continuously.

What is a good Lighthouse score for a BigCommerce theme?

Google's bands are 90–100 good, 50–89 needs improvement, 0–49 poor. The median mobile speed score across tested BigCommerce themes is 75, and 0 of 12 (0%) reach 90 or better. Mobile scores run well below desktop for the same theme because Lighthouse simulates a mid-range phone on a slow connection.