Laboratory Mainframe
Laboratory Mainframe is a Framer theme by Josefino Joestar (Free). Tested on 2026-09-13 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 80 for mobile speed and 99 for desktop speed, 100/100 for SEO and 83/83 for accessibility (mobile/desktop, 0–100).
Mobile80
Desktop99
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 80 | 99 |
| SEO | 100 | 100 |
| Accessibility | 83 | 83 |
| 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 — Laboratory Mainframe home page
Mobile
Speed 80 · 20 points to gain
- −14.3 Largest Contentful Paint medium effort
- −3.1 First Contentful Paint medium effort
- −2 Cumulative Layout Shift medium effort
- 450 ms Reduce unused JavaScript high effort
Accessibility 83 · 17 points to gain
- −7 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −7 `<html>` element does not have a `[lang]` attribute low effort
- −3 Document does not have a main landmark. medium effort
Desktop
Speed 99 · 1 points to gain
- −1 Largest Contentful Paint medium effort
Accessibility 83 · 17 points to gain
- −7 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −7 `<html>` element does not have a `[lang]` attribute low effort
- −3 Document does not have a main landmark. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Laboratory Mainframe default demo ↗ | 80 | 100 | 83 | 99 | 100 | 83 | 2026-09-13 |
| home ↗ | 80 | 100 | 83 | 99 | 100 | 83 | 2026-09-13 |
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<a href="https://themestested.com/theme/framer/laboratory-mainframe"><img src="https://themestested.com/badge/framer/laboratory-mainframe.svg" alt="Laboratory Mainframe speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.