Cello
Cello is a Shopify theme by Webibazaar Templates ($160). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 78 for mobile speed and 96 for desktop speed, 95/95 for SEO and 97/96 for accessibility (mobile/desktop, 0–100). Those are medians across its 5 tested presets; mobile speed across every tested page ranges from 64 to 84. On its marketplace it is rated 5.0 out of 5 from 79 reviews.
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 78 | 96 |
| SEO | 95 | 95 |
| Accessibility | 97 | 96 |
| 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 — Dazzle home page
Mobile
Speed 68 · 32 points to gain
- −22.3 Largest Contentful Paint medium effort
- −4.8 First Contentful Paint medium effort
- −4.5 Speed Index medium effort
- 180 ms Reduce unused CSS high effort
- 180 ms Reduce unused JavaScript high effort
SEO 77 · 23 points to gain
- −7.7 Document does not have a meta description low effort
- −7.7 Links do not have descriptive text low effort
- −7.7 Image elements do not have `[alt]` attributes low effort
Accessibility 95 · 5 points to gain
- −4.9 Image elements do not have `[alt]` attributes low 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 71 · 29 points to gain
- −20.4 Total Blocking Time medium effort
- −5.8 Speed Index medium effort
- −2.5 Largest Contentful Paint medium effort
SEO 77 · 23 points to gain
- −7.7 Document does not have a meta description low effort
- −7.7 Links do not have descriptive text low effort
- −7.7 Image elements do not have `[alt]` attributes low effort
Accessibility 95 · 5 points to gain
- −4.9 Image elements do not have `[alt]` attributes low 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 | ||||||
| Dazzle default demo ↗ | 71 | 92 | 97 | 89 | 92 | 97 | 2026-09-11 |
| category ↗ | 68 | 100 | 95 | 99 | 100 | 97 | 2026-09-12 |
| home ↗ | 68 | 77 | 95 | 71 | 77 | 95 | 2026-09-11 |
| product ↗ | 78 | 100 | 100 | 98 | 100 | 100 | 2026-09-12 |
| Strings demo ↗ | 78 | 95 | 96 | 96 | 95 | 96 | 2026-09-12 |
| category ↗ | 84 | 100 | 95 | 98 | 100 | 97 | 2026-09-12 |
| home ↗ | 72 | 85 | 92 | 93 | 85 | 92 | 2026-09-12 |
| product ↗ | 78 | 100 | 100 | 98 | 100 | 100 | 2026-09-12 |
| Snitch demo ↗ | 81 | 95 | 96 | 98 | 95 | 96 | 2026-09-12 |
| category ↗ | 82 | 100 | 95 | 99 | 100 | 97 | 2026-09-12 |
| home ↗ | 81 | 85 | 92 | 98 | 85 | 92 | 2026-09-12 |
| product ↗ | 79 | 100 | 100 | 97 | 100 | 100 | 2026-09-12 |
| Crescendo demo ↗ | 79 | 95 | 97 | 97 | 95 | 96 | 2026-09-12 |
| category ↗ | 82 | 100 | 95 | 98 | 100 | 97 | 2026-09-12 |
| home ↗ | 75 | 85 | 95 | 96 | 85 | 92 | 2026-09-12 |
| product ↗ | 79 | 100 | 100 | 97 | 100 | 100 | 2026-09-12 |
| Cello demo ↗ | 75 | 92 | 97 | 96 | 92 | 97 | 2026-09-12 |
| category ↗ | 83 | 100 | 95 | 99 | 100 | 97 | 2026-09-12 |
| home ↗ | 64 | 77 | 95 | 91 | 77 | 95 | 2026-09-12 |
| product ↗ | 78 | 100 | 100 | 99 | 100 | 100 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Cello's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/shopify/cello"><img src="https://themestested.com/badge/shopify/cello.svg" alt="Cello speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.