Mercia
Mercia is a WordPress theme by ThemeZee (Free). Tested on 2026-09-12 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 90 for mobile speed and 99 for desktop speed, 50/50 for SEO and 93/93 for accessibility (mobile/desktop, 0–100). On its marketplace it is rated 5.0 out of 5 from 1 reviews. Note: its demo home page is light — 114 KB in 8 requests — where a stocked storefront is usually 1–4 MB, so the speed score flatters it.
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 90 | 99 |
| SEO | 50 | 50 |
| Accessibility | 93 | 93 |
| 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 — Mercia home page
Mobile
Speed 90 · 10 points to gain
- −4.2 First Contentful Paint medium effort
- −4 Largest Contentful Paint medium effort
- −1.5 Cumulative Layout Shift medium effort
SEO 50 · 50 points to gain
- −40.3 Page is blocked from indexing low effort
- −10 Document does not have a meta description low effort
Accessibility 93 · 7 points to gain
- −7.1 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
SEO 50 · 50 points to gain
- −40.3 Page is blocked from indexing low effort
- −10 Document does not have a meta description low effort
Accessibility 93 · 7 points to gain
- −7.1 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 | ||||||
| Mercia default demo ↗ | 90 | 50 | 93 | 99 | 50 | 93 | 2026-09-12 |
| home ↗ | 90 | 50 | 93 | 99 | 50 | 93 | 2026-09-12 |
Show this score on your site
A live badge: it always shows Mercia's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/wordpress/mercia"><img src="https://themestested.com/badge/wordpress/mercia.svg" alt="Mercia speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.