Héron
Héron is a Squarespace theme by Squarespace (Free). Tested on 2026-11-04 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 51 for mobile speed and 62 for desktop speed, 92/92 for SEO and 95/95 for accessibility (mobile/desktop, 0–100). Note: its demo home page is heavy — 36.5 MB — heavier than a typical store, so the speed score may understate the theme.
Mobile51
Desktop62
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 51 | 62 |
| SEO | 92 | 92 |
| Accessibility | 95 | 95 |
| Best practices | 96 | 96 |
Single preset · measured 10 times since 2026-09-15 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.
Why not 100 — Héron home page
Mobile
Speed 51 · 49 points to gain
- −25 Largest Contentful Paint medium effort
- −13.2 Total Blocking Time medium effort
- −6.8 Speed Index medium effort
- −4.5 First Contentful Paint medium effort
- 2.9 s Reduce unused JavaScript high 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
Speed 62 · 38 points to gain
- −25 Largest Contentful Paint medium effort
- −9.9 Total Blocking Time medium effort
- −3.2 Speed Index medium effort
- 200 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
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Héron default demo ↗ | 51 | 92 | 95 | 62 | 92 | 95 | 2026-11-04 |
| home ↗ | 51 | 92 | 95 | 62 | 92 | 95 | 2026-11-04 |
Show this score on your site
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<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.