Sero
Sero is a Framer theme by Dean (Free). Tested on 2026-09-14 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 78 for mobile speed and 92 for desktop speed, 92/92 for SEO and 73/74 for accessibility (mobile/desktop, 0–100).
Mobile78
Desktop92
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 78 | 92 |
| SEO | 92 | 92 |
| Accessibility | 73 | 74 |
| Best practices | 100 | 100 |
Single preset · measured 2 times since 2026-09-14 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Sero home page
Mobile
Speed 78 · 22 points to gain
- −19.3 Largest Contentful Paint medium effort
- −1.7 First Contentful Paint medium effort
- −0.8 Speed Index medium effort
- 300 ms Reduce unused JavaScript high effort
SEO 92 · 8 points to gain
- −7.7 Links are not crawlable medium effort
Accessibility 73 · 27 points to gain
- −6 `[aria-hidden="true"]` elements contain focusable descendents medium effort
- −6 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −6 `<html>` element does not have a `[lang]` attribute low effort
- −6 Links do not have a discernible name medium effort
- −2.6 Document does not have a main landmark. medium effort
Desktop
Speed 92 · 8 points to gain
- −4.9 Speed Index medium effort
- −2.7 Largest Contentful Paint medium effort
SEO 92 · 8 points to gain
- −7.7 Links are not crawlable medium effort
Accessibility 74 · 26 points to gain
- −6.3 Buttons do not have an accessible name medium effort
- −4.4 `[aria-hidden="true"]` elements contain focusable descendents medium effort
- −4.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −4.4 `<html>` element does not have a `[lang]` attribute low effort
- −4.4 Links do not have a discernible name medium effort
- −1.9 Document does not have a main landmark. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Sero default demo ↗ | 78 | 92 | 73 | 92 | 92 | 74 | 2026-09-14 |
| home ↗ | 78 | 92 | 73 | 92 | 92 | 74 | 2026-09-14 |
Show this score on your site
A live badge: it always shows Sero's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/framer/sero"><img src="https://themestested.com/badge/framer/sero.svg" alt="Sero speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.