Quantum
Quantum is a Astro theme by Cosmic Themes (Paid). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 99 for mobile speed and – for desktop speed, 100/– for SEO and 100/– for accessibility (mobile/desktop, 0–100). Note: its demo home page is light — 149 KB in 6 requests — where a stocked storefront is usually 1–4 MB, so the speed score flatters it.
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 99 | – |
| SEO | 100 | – |
| Accessibility | 100 | – |
| Best practices | 100 | – |
Single preset · measured 1 times since 2026-09-12 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Quantum home page
Mobile
Speed 99 · 1 points to gain
- −0.7 Speed Index medium effort
Desktop
Not extracted yet for this page.
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Quantum default demo ↗ | 99 | 100 | 100 | – | – | – | 2026-09-12 |
| home ↗ | 99 | 100 | 100 | – | – | – | 2026-09-12 |
Show this score on your site
A live badge: it always shows Quantum's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/quantum"><img src="https://themestested.com/badge/astro/quantum.svg" alt="Quantum speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.