Jetstream
Jetstream is a Astro theme by David Large (Free). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 99 for mobile speed and 99 for desktop speed, 69/69 for SEO and 95/90 for accessibility (mobile/desktop, 0–100).
Mobile99
Desktop99
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 99 | 99 |
| SEO | 69 | 69 |
| Accessibility | 95 | 90 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-12 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Jetstream home page
Mobile
Speed 99 · 1 points to gain
- −0.8 Largest Contentful Paint medium effort
SEO 69 · 31 points to gain
- −31 Page is blocked from indexing low effort
Accessibility 95 · 5 points to gain
- −4.8 Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children. medium effort
Desktop
Speed 99 · 1 points to gain
- −0.8 Speed Index medium effort
SEO 69 · 31 points to gain
- −31 Page is blocked from indexing low effort
Accessibility 90 · 10 points to gain
- −4.8 `[aria-*]` attributes do not match their roles medium effort
- −4.8 Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Jetstream default demo ↗ | 99 | 69 | 95 | 99 | 69 | 90 | 2026-09-12 |
| home ↗ | 99 | 69 | 95 | 99 | 69 | 90 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Jetstream's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/jetstream"><img src="https://themestested.com/badge/astro/jetstream.svg" alt="Jetstream speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.