LeftSide
LeftSide is a WordPress theme by Guido (Free). Tested on 2026-09-13 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 90 for mobile speed and 100 for desktop speed, 54/54 for SEO and 94/94 for accessibility (mobile/desktop, 0–100). On its marketplace it is rated 4.5 out of 5 from 2 reviews. Note: its demo home page is light — 131 KB in 5 requests — where a stocked storefront is usually 1–4 MB, so the speed score flatters it.
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 90 | 100 |
| SEO | 54 | 54 |
| Accessibility | 94 | 94 |
| 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 — LeftSide home page
Mobile
Speed 90 · 10 points to gain
- −9.8 Cumulative Layout Shift medium effort
SEO 54 · 46 points to gain
- −36.6 Page is blocked from indexing low effort
- −9.1 Document does not have a meta description low effort
Accessibility 94 · 6 points to gain
- −6.4 Background and foreground colors do not have a sufficient contrast ratio. medium effort
Desktop
SEO 54 · 46 points to gain
- −36.6 Page is blocked from indexing low effort
- −9.1 Document does not have a meta description low effort
Accessibility 94 · 6 points to gain
- −6.4 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 | ||||||
| LeftSide default demo ↗ | 90 | 54 | 94 | 100 | 54 | 94 | 2026-09-13 |
| home ↗ | 90 | 54 | 94 | 100 | 54 | 94 | 2026-09-13 |
Show this score on your site
A live badge: it always shows LeftSide's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/wordpress/leftside"><img src="https://themestested.com/badge/wordpress/leftside.svg" alt="LeftSide speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.