Mainline
Mainline is a Astro theme by Rob Austin (Free). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 93 for mobile speed and 100 for desktop speed, 100/100 for SEO and 96/96 for accessibility (mobile/desktop, 0–100).
Mobile93
Desktop100
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 93 | 100 |
| SEO | 100 | 100 |
| Accessibility | 96 | 96 |
| 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 — Mainline home page
Mobile
Speed 93 · 7 points to gain
- −4 Largest Contentful Paint medium effort
- −2.4 Speed Index medium effort
- 150 ms Reduce unused JavaScript high effort
Accessibility 96 · 4 points to gain
- −3.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
Accessibility 96 · 4 points to gain
- −3.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Mainline default demo ↗ | 93 | 100 | 96 | 100 | 100 | 96 | 2026-09-12 |
| home ↗ | 93 | 100 | 96 | 100 | 100 | 96 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Mainline's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/astro/mainline"><img src="https://themestested.com/badge/astro/mainline.svg" alt="Mainline speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.