Costello
Costello is a WordPress theme by Catch Themes (Free). Tested on 2026-09-13 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 92 for mobile speed and 99 for desktop speed, 45/45 for SEO and 82/91 for accessibility (mobile/desktop, 0–100).
Mobile92
Desktop99
Scores
| Mobile | Desktop | |
|---|---|---|
| Speed | 92 | 99 |
| SEO | 45 | 45 |
| Accessibility | 82 | 91 |
| 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 — Costello home page
Mobile
Speed 92 · 8 points to gain
- −4 First Contentful Paint medium effort
- −3.8 Largest Contentful Paint medium effort
SEO 45 · 55 points to gain
- −36.6 Page is blocked from indexing low effort
- −9.1 Document does not have a meta description low effort
- −9.1 Image elements do not have `[alt]` attributes low effort
Accessibility 82 · 18 points to gain
- −6.7 Buttons do not have an accessible name medium effort
- −6.7 Image elements do not have `[alt]` attributes low effort
- −4.7 Links rely on color to be distinguishable. medium effort
Desktop
Speed 99 · 1 points to gain
- −0.5 Largest Contentful Paint medium effort
SEO 45 · 55 points to gain
- −36.6 Page is blocked from indexing low effort
- −9.1 Document does not have a meta description low effort
- −9.1 Image elements do not have `[alt]` attributes low effort
Accessibility 91 · 9 points to gain
- −5.4 Image elements do not have `[alt]` attributes low effort
- −3.8 Links rely on color to be distinguishable. medium effort
Presets and pages
| Preset / page | Speed | SEO | A11y | Speed | SEO | A11y | Tested |
|---|---|---|---|---|---|---|---|
| mobile | desktop | ||||||
| Costello default demo ↗ | 92 | 45 | 82 | 99 | 45 | 91 | 2026-09-13 |
| home ↗ | 92 | 45 | 82 | 99 | 45 | 91 | 2026-09-13 |
Show this score on your site
A live badge: it always shows Costello's current score and links back here. Paste this where the theme is sold or documented.
<a href="https://themestested.com/theme/wordpress/costello"><img src="https://themestested.com/badge/wordpress/costello.svg" alt="Costello speed score on Themestested" height="20"></a>
Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.