Atlantic
Atlantic 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 66 for mobile speed and 92 for desktop speed, 92/92 for SEO and 94/94 for accessibility (mobile/desktop, 0–100).
Mobile66
Desktop92
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 66 | 92 |
| SEO | 92 | 92 |
| Accessibility | 94 | 94 |
| Best practices | 100 | 100 |
Single preset · measured 12 times since 2026-11-04 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Atlantic home page
Mobile
Speed 66 · 34 points to gain
- −25 Largest Contentful Paint medium effort
- −4.6 Speed Index medium effort
- −3.6 First Contentful Paint medium effort
- −1.2 Total Blocking Time medium effort
- 1.9 s Reduce unused JavaScript high effort
- 490 ms Reduce unused CSS high effort
SEO 92 · 8 points to gain
- −7.7 Document does not have a meta description low effort
Accessibility 94 · 6 points to gain
- −4.3 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −1.9 Heading elements are not in a sequentially-descending order medium effort
Desktop
Speed 92 · 8 points to gain
- −7 Largest Contentful Paint medium effort
- −0.9 Total Blocking Time medium effort
- −0.5 Speed Index 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 94 · 6 points to gain
- −4.3 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −1.9 Heading elements are not in a sequentially-descending order medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Atlantic default demo ↗ | 66 | 92 | 94 | 92 | 92 | 94 | 2026-11-04 |
| home ↗ | 66 | 92 | 94 | 92 | 92 | 94 | 2026-11-04 |
Show this score on your site
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<a href="https://themestested.com/theme/squarespace/atlantic-fluid-demo"><img src="https://themestested.com/badge/squarespace/atlantic-fluid-demo.svg" alt="Atlantic speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.