Mizuki
Mizuki is a Astro theme by 汐涌及岸 (Free). Tested on 2026-09-13 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 85 for mobile speed and 57 for desktop speed, 92/92 for SEO and 100/94 for accessibility (mobile/desktop, 0–100). Note: its demo home page is heavy — 7.4 MB — heavier than a typical store, so the speed score may understate the theme.
Mobile85
Desktop57
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 85 | 57 |
| SEO | 92 | 92 |
| Accessibility | 100 | 94 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-13 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Mizuki home page
Mobile
Speed 85 · 15 points to gain
- −9.8 Largest Contentful Paint medium effort
- −3.4 Speed Index medium effort
- −2.2 First Contentful Paint medium effort
SEO 92 · 8 points to gain
- −8.3 Links do not have descriptive text low effort
Desktop
Speed 57 · 43 points to gain
- −30 Total Blocking Time medium effort
- −9.9 Speed Index medium effort
- −2.2 Largest Contentful Paint medium effort
- −0.7 First Contentful Paint medium effort
SEO 92 · 8 points to gain
- −8.3 Links do not have descriptive text low effort
Accessibility 94 · 6 points to gain
- −3.1 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −3.1 `<frame>` or `<iframe>` elements do not have a title low effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Mizuki default demo ↗ | 85 | 92 | 100 | 57 | 92 | 94 | 2026-09-13 |
| home ↗ | 85 | 92 | 100 | 57 | 92 | 94 | 2026-09-13 |
Show this score on your site
A live badge: it always shows Mizuki's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/mizuki"><img src="https://themestested.com/badge/astro/mizuki.svg" alt="Mizuki speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.