Koharu
Koharu is a Astro theme by cos (Free). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 92 for mobile speed and 88 for desktop speed, 100/100 for SEO and 100/100 for accessibility (mobile/desktop, 0–100).
Mobile92
Desktop88
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 92 | 88 |
| SEO | 100 | 100 |
| Accessibility | 100 | 100 |
| 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 — Koharu home page
Mobile
Speed 92 · 8 points to gain
- −5.5 Largest Contentful Paint medium effort
- −1.5 First Contentful Paint medium effort
- −0.6 Speed Index medium effort
- 440 ms Reduce unused CSS high effort
Best practices 96 · 4 points to gain
- −3.8 Browser errors were logged to the console medium effort
Desktop
Speed 88 · 12 points to gain
- −4.6 Speed Index medium effort
- −3.6 Total Blocking Time medium effort
- −3.3 Largest Contentful Paint 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 | ||||||
| Koharu default demo ↗ | 92 | 100 | 100 | 88 | 100 | 100 | 2026-09-12 |
| home ↗ | 92 | 100 | 100 | 88 | 100 | 100 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Koharu's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/koharu"><img src="https://themestested.com/badge/astro/koharu.svg" alt="Koharu speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.