Cornerstone Bold
Cornerstone Bold is a BigCommerce theme by BigCommerce (Free). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 86 for mobile speed and 98 for desktop speed, 51/51 for SEO and 93/95 for accessibility (mobile/desktop, 0–100).
Mobile87
Desktop98
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 86 | 98 |
| SEO | 51 | 51 |
| Accessibility | 93 | 95 |
| Best practices | 100 | 100 |
Single preset · measured 6 times since 2026-09-11 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Cornerstone-Bold home page
Mobile
Speed 87 · 13 points to gain
- −9 Largest Contentful Paint medium effort
- −3.6 First Contentful Paint medium effort
- 300 ms Reduce unused JavaScript high effort
- 150 ms Reduce unused CSS high effort
SEO 54 · 46 points to gain
- −31 Page is blocked from indexing low effort
- −7.7 Document does not have a meta description low effort
- −7.7 Links do not have descriptive text low effort
Accessibility 85 · 15 points to gain
- −3.4 `[aria-hidden="true"]` elements contain focusable descendents medium effort
- −3.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.4 Links do not have a discernible name medium effort
- −3.4 Touch targets do not have sufficient size or spacing. medium effort
- −1.5 Document does not have a main landmark. medium effort
Desktop
Speed 98 · 2 points to gain
- −1.5 Largest Contentful Paint medium effort
SEO 54 · 46 points to gain
- −31 Page is blocked from indexing low effort
- −7.7 Document does not have a meta description low effort
- −7.7 Links do not have descriptive text low effort
Accessibility 92 · 8 points to gain
- −3.4 Links do not have a discernible name medium effort
- −3.4 Touch targets do not have sufficient size or spacing. medium effort
- −1.5 Document does not have a main landmark. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Cornerstone-Bold default demo ↗ | 86 | 51 | 93 | 98 | 51 | 95 | 2026-09-11 |
| category ↗ | 85 | 54 | 97 | 98 | 54 | 97 | 2026-09-12 |
| home ↗ | 87 | 54 | 85 | 98 | 54 | 92 | 2026-09-11 |
| product ↗ | 85 | 46 | 96 | 99 | 46 | 96 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Cornerstone Bold's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/bigcommerce/cornerstone-bold"><img src="https://themestested.com/badge/bigcommerce/cornerstone-bold.svg" alt="Cornerstone Bold speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.