Sonic
Sonic is a Astro theme by Rob Austin (Paid). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 94 for mobile speed and 99 for desktop speed, 100/100 for SEO and 94/94 for accessibility (mobile/desktop, 0–100).
Mobile94
Desktop99
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 94 | 99 |
| SEO | 100 | 100 |
| Accessibility | 94 | 94 |
| Best practices | 96 | 96 |
Single preset · measured 2 times since 2026-09-12 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Sonic home page
Mobile
Speed 94 · 6 points to gain
- −3 Speed Index medium effort
- −1.3 Cumulative Layout Shift medium effort
- −1 Largest Contentful Paint medium effort
- −0.6 First Contentful Paint medium effort
- 150 ms Reduce unused JavaScript high effort
Accessibility 94 · 6 points to gain
- −5.7 Buttons do not have an accessible name medium effort
Best practices 96 · 4 points to gain
- −3.8 Browser errors were logged to the console medium effort
Desktop
Speed 99 · 1 points to gain
- −0.7 Speed Index medium effort
Accessibility 94 · 6 points to gain
- −5.7 Buttons do not have an accessible name 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 | ||||||
| Sonic default demo ↗ | 94 | 100 | 94 | 99 | 100 | 94 | 2026-09-12 |
| home ↗ | 94 | 100 | 94 | 99 | 100 | 94 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Sonic's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/sonic"><img src="https://themestested.com/badge/astro/sonic.svg" alt="Sonic speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.