Cornerstone Warm
Cornerstone Warm is a BigCommerce theme by BigCommerce (Free). Tested on 2026-09-15 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 85 for mobile speed and 99 for desktop speed, 59/59 for SEO and 91/91 for accessibility (mobile/desktop, 0–100).
Mobile79
Desktop98
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 85 | 99 |
| SEO | 59 | 59 |
| Accessibility | 91 | 91 |
| 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-Warm home page
Mobile
Speed 79 · 21 points to gain
- −14.8 Largest Contentful Paint medium effort
- −4.8 First Contentful Paint medium effort
- −1 Speed Index medium effort
- 300 ms Reduce unused JavaScript high effort
SEO 61 · 39 points to gain
- −31 Page is blocked from indexing low effort
- −7.7 Document does not have a meta description low effort
Accessibility 88 · 12 points to gain
- −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
- −1.7 Largest Contentful Paint medium effort
SEO 61 · 39 points to gain
- −31 Page is blocked from indexing low effort
- −7.7 Document does not have a meta description low effort
Accessibility 88 · 12 points to gain
- −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
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Cornerstone-Warm default demo ↗ | 85 | 59 | 91 | 99 | 59 | 91 | 2026-09-11 |
| category ↗ | 88 | 61 | 93 | 99 | 61 | 94 | 2026-09-15 |
| home ↗ | 79 | 61 | 88 | 98 | 61 | 88 | 2026-09-11 |
| product ↗ | 88 | 54 | 92 | 99 | 54 | 92 | 2026-09-15 |
Show this score on your site
A live badge: it always shows Cornerstone Warm's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/bigcommerce/cornerstone-warm"><img src="https://themestested.com/badge/bigcommerce/cornerstone-warm.svg" alt="Cornerstone Warm speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.