Mason
Mason is a Squarespace theme by Squarespace (Free). Tested on 2026-11-04 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 85 for mobile speed and 90 for desktop speed, 92/92 for SEO and 96/96 for accessibility (mobile/desktop, 0–100).
Mobile85
Desktop90
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 85 | 90 |
| SEO | 92 | 92 |
| Accessibility | 96 | 96 |
| Best practices | 100 | 100 |
Single preset · measured 10 times since 2026-11-04 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Mason home page
Mobile
Speed 85 · 15 points to gain
- −5.8 Largest Contentful Paint medium effort
- −5.2 First Contentful Paint medium effort
- −3.3 Speed Index medium effort
- −0.6 Total Blocking Time medium effort
- 750 ms Reduce unused CSS high effort
- 150 ms Reduce unused JavaScript high effort
SEO 92 · 8 points to gain
- −7.7 Document does not have a meta description low effort
Accessibility 96 · 4 points to gain
- −4.1 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
Speed 90 · 10 points to gain
- −5.2 Largest Contentful Paint medium effort
- −4.5 Total Blocking Time medium effort
- 250 ms Reduce unused JavaScript high effort
- 120 ms Reduce unused CSS high effort
SEO 92 · 8 points to gain
- −7.7 Document does not have a meta description low effort
Accessibility 96 · 4 points to gain
- −4.1 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Mason default demo ↗ | 85 | 92 | 96 | 90 | 92 | 96 | 2026-11-04 |
| home ↗ | 85 | 92 | 96 | 90 | 92 | 96 | 2026-11-04 |
Show this score on your site
A live badge: it always shows Mason's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/squarespace/mason-fluid-demo"><img src="https://themestested.com/badge/squarespace/mason-fluid-demo.svg" alt="Mason speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.