State of BigCommerce theme speed — September 2026
As of 2026-09-15, 239 BigCommerce themes have Google Lighthouse speed scores on Themestested, measured on their own demo stores. The median mobile speed score is 61 (desktop 82); 0 themes (0%) score 90 or better on mobile. The highest is Cornerstone Bold by BigCommerce at 86, then Cornerstone Warm at 85 and Artify Electronics at 82. Among the themes first tested in September 2026, the best for mobile speed is Cornerstone Bold at 86.
Top BigCommerce themes for speed
Highest mobile speed score as of 2026-09-15; the desktop score beside it. A theme's score is the median of its tested presets.
| Theme | Mobile | Desktop | Price | |
|---|---|---|---|---|
| 1 | Cornerstone Bold · BigCommerce | 86 | 98 | Free |
| 2 | Cornerstone Warm · BigCommerce | 85 | 99 | Free |
| 3 | Artify Electronics · 1Center | 82 | 90 | $150 |
| 4 | Cornerstone Light · BigCommerce | 82 | 98 | Free |
| 5 | Samras Furniture · VisionsDeveloper | 80 | 83 | $310 |
| 6 | Covent Garden Bright · Flair Consultancy | 77 | 97 | $235 |
| 7 | Kansha CBD · Papathemes | 77 | 72 | $245 |
| 8 | Vault Natural · Lonestar Templates | 77 | 94 | Free |
| 9 | Camden B2B · Flair Consultancy | 76 | 89 | $235 |
| 10 | Camden Catalog · Flair Consultancy | 76 | 93 | $235 |
New this month
Themes first tested in September 2026, best first.
| Theme | Mobile | Desktop | Price | |
|---|---|---|---|---|
| 1 | Cornerstone Bold · BigCommerce | 86 | 98 | Free |
| 2 | Cornerstone Warm · BigCommerce | 85 | 99 | Free |
| 3 | Artify Electronics · 1Center | 82 | 90 | $150 |
| 4 | Cornerstone Light · BigCommerce | 82 | 98 | Free |
| 5 | Samras Furniture · VisionsDeveloper | 80 | 83 | $310 |
| 6 | Covent Garden Bright · Flair Consultancy | 77 | 97 | $235 |
| 7 | Kansha CBD · Papathemes | 77 | 72 | $245 |
| 8 | Vault Natural · Lonestar Templates | 77 | 94 | Free |
| 9 | Camden B2B · Flair Consultancy | 76 | 89 | $235 |
| 10 | Camden Catalog · Flair Consultancy | 76 | 93 | $235 |
Trending
The biggest changes in mobile speed between a theme's latest test and its last test at least a week earlier. A move of 3 points or more counts; Lighthouse varies by a point or two between runs.
Not enough re-tests yet: trending needs a theme measured at least a week apart, and the score history began on 2026-09-11. This section fills in as themes are re-measured.
Distribution
How all 239 tested BigCommerce themes fall across Google's bands.
About this report
Scores are Google Lighthouse performance scores from the PageSpeed Insights API, run against each theme's own demo store — the home page and, on store platforms, a collection and a product page — on a simulated mid-range phone and on desktop. A theme's score is the median of its presets; a preset's is the mean of its pages. Every run is kept, and a theme's page shows its history. This month's report updates daily until the month ends. Read the full methodology, or see the live BigCommerce speed ranking.
Other months: none yet
Other reports for September 2026: SEOaccessibility