Héron
Héron is a Squarespace theme by Squarespace (Free). Tested on 2026-09-15 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 58 for mobile speed and – for desktop speed, 92/– for SEO and 95/– for accessibility (mobile/desktop, 0–100). Note: its demo home page is heavy — 24.9 MB — heavier than a typical store, so the speed score may understate the theme.
Mobile58
Desktop
Screenshot pending
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 58 | – |
| SEO | 92 | – |
| Accessibility | 95 | – |
| Best practices | 96 | – |
Single preset · measured 1 times since 2026-09-15 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Héron home page
Mobile
Speed 58 · 42 points to gain
- −25 Largest Contentful Paint medium effort
- −9 Total Blocking Time medium effort
- −4.6 First Contentful Paint medium effort
- −3.1 Speed Index medium effort
- 610 ms Reduce unused CSS high effort
SEO 92 · 8 points to gain
- −7.7 Document does not have a meta description low effort
Accessibility 95 · 5 points to gain
- −3.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
- −1.5 Heading elements are not in a sequentially-descending order medium effort
Best practices 96 · 4 points to gain
- −3.8 Browser errors were logged to the console medium effort
Desktop
Not extracted yet for this page.
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Héron default demo ↗ | 58 | 92 | 95 | – | – | – | 2026-09-15 |
| home ↗ | 58 | 92 | 95 | – | – | – | 2026-09-15 |
Show this score on your site
A live badge: it always shows Héron's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/squarespace/heron-fluid-demo"><img src="https://themestested.com/badge/squarespace/heron-fluid-demo.svg" alt="Héron speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.