Atlantic
Atlantic is a Shopify theme by Pixel Union ($300). Tested on 2026-09-11 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 67 for mobile speed and 85 for desktop speed, 100/100 for SEO and 93/93 for accessibility (mobile/desktop, 0–100). Those are medians across its 5 tested presets; mobile speed across every tested page ranges from 53 to 83. On its marketplace it is rated 4.9 out of 5 from 226 reviews.
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 67 | 85 |
| SEO | 100 | 100 |
| Accessibility | 93 | 93 |
| Best practices | 93 | 93 |
Median of 5 presets · measured 30 times since 2026-09-11 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Plush home page
Mobile
Speed 63 · 37 points to gain
- −24.8 Largest Contentful Paint medium effort
- −7 First Contentful Paint medium effort
- −2.7 Speed Index medium effort
- −2.4 Total Blocking Time medium effort
- 1.9 s Reduce unused JavaScript high effort
- 480 ms Reduce unused CSS high effort
Accessibility 90 · 10 points to gain
- −3.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.9 Links rely on color to be distinguishable. medium effort
- −1.7 Heading elements are not in a sequentially-descending order medium effort
Best practices 92 · 8 points to gain
- −3.8 Browser errors were logged to the console medium effort
- −3.8 Issues were logged in the `Issues` panel in Chrome Devtools high effort
Desktop
Speed 89 · 11 points to gain
- −8.5 Largest Contentful Paint medium effort
- −2.1 Total Blocking Time medium effort
- −0.5 Speed Index medium effort
- 160 ms Reduce unused JavaScript high effort
Accessibility 90 · 10 points to gain
- −3.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.9 Links rely on color to be distinguishable. medium effort
- −1.7 Heading elements are not in a sequentially-descending order medium effort
Best practices 92 · 8 points to gain
- −3.8 Browser errors were logged to the console medium effort
- −3.8 Issues were logged in the `Issues` panel in Chrome Devtools high effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Plush default demo ↗ | 67 | 100 | 93 | 84 | 100 | 93 | 2026-09-11 |
| category ↗ | 73 | 100 | 96 | 74 | 100 | 96 | 2026-09-11 |
| home ↗ | 63 | 100 | 90 | 89 | 100 | 90 | 2026-09-11 |
| product ↗ | 64 | 100 | 93 | 88 | 100 | 93 | 2026-09-11 |
| Atrium demo ↗ | 68 | 100 | 92 | 83 | 100 | 92 | 2026-09-11 |
| category ↗ | 67 | 100 | 87 | 94 | 100 | 87 | 2026-09-11 |
| home ↗ | 77 | 100 | 92 | 80 | 100 | 92 | 2026-09-11 |
| product ↗ | 61 | 100 | 96 | 75 | 100 | 96 | 2026-09-11 |
| Cotton demo ↗ | 58 | 100 | 97 | 87 | 100 | 97 | 2026-09-11 |
| category ↗ | 64 | 100 | 100 | 81 | 100 | 100 | 2026-09-11 |
| home ↗ | 56 | 100 | 96 | 86 | 100 | 96 | 2026-09-11 |
| product ↗ | 55 | 100 | 96 | 94 | 100 | 96 | 2026-09-11 |
| Parfum demo ↗ | 60 | 97 | 91 | 85 | 97 | 91 | 2026-09-11 |
| category ↗ | 62 | 100 | 87 | 90 | 100 | 87 | 2026-09-11 |
| home ↗ | 53 | 92 | 90 | 73 | 92 | 90 | 2026-09-11 |
| product ↗ | 64 | 100 | 96 | 91 | 100 | 96 | 2026-09-11 |
| Atlantic demo ↗ | 74 | 95 | 94 | 95 | 95 | 94 | 2026-09-11 |
| category ↗ | 64 | 92 | 96 | 95 | 92 | 96 | 2026-09-11 |
| home ↗ | 76 | 92 | 90 | 93 | 92 | 90 | 2026-09-11 |
| product ↗ | 83 | 100 | 96 | 96 | 100 | 96 | 2026-09-11 |
Show this score on your site
A live badge: it always shows Atlantic's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/shopify/atlantic"><img src="https://themestested.com/badge/shopify/atlantic.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.