Mosley
Mosley is a Squarespace theme by Squarespace (Free). Tested on 2026-09-15 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 50 for mobile speed and 41 for desktop speed, 85/92 for SEO and 95/95 for accessibility (mobile/desktop, 0–100).
Mobile50
Desktop41
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 50 | 41 |
| SEO | 85 | 92 |
| Accessibility | 95 | 95 |
| Best practices | 96 | 96 |
Single preset · measured 2 times since 2026-09-14 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Mosley home page
Mobile
Speed 50 · 50 points to gain
- −25 Largest Contentful Paint medium effort
- −10 First Contentful Paint medium effort
- −9.8 Speed Index medium effort
- −5.7 Total Blocking Time medium effort
- 6.3 s Reduce unused JavaScript high effort
- 740 ms Reduce unused CSS high effort
SEO 85 · 15 points to gain
- −7.7 Document does not have a meta description low effort
- −7.7 robots.txt is not valid outside the theme
Accessibility 95 · 5 points to gain
- −3.6 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −1.6 Heading elements are not in a sequentially-descending order medium effort
Best practices 96 · 4 points to gain
- −3.8 Browser errors were logged to the console medium effort
Desktop
Speed 41 · 59 points to gain
- −28.8 Total Blocking Time medium effort
- −21 Largest Contentful Paint medium effort
- −8.6 Speed Index medium effort
- −0.8 First Contentful Paint medium effort
- 1.0 s Reduce unused JavaScript high effort
- 150 ms Reduce unused CSS high effort
SEO 92 · 8 points to gain
- −7.7 Document does not have a meta description low effort
Accessibility 95 · 5 points to gain
- −3.6 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −1.6 Heading elements are not in a sequentially-descending order medium effort
Best practices 96 · 4 points to gain
- −3.8 Browser errors were logged to the console medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Mosley default demo ↗ | 50 | 85 | 95 | 41 | 92 | 95 | 2026-09-14 |
| home ↗ | 50 | 85 | 95 | 41 | 92 | 95 | 2026-09-14 |
Show this score on your site
A live badge: it always shows Mosley's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/squarespace/mosley"><img src="https://themestested.com/badge/squarespace/mosley.svg" alt="Mosley speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.