themestestedbyWhirlwind eCommerce logo — Shopify and BigCommerce ecommerce development agencyWhirlwind eCommerce
Boost theme preview

Boost

Boost is a Shopify theme by Clean Canvas ($380). Tested on 2026-11-08 with Google Lighthouse via PageSpeed Insights on its own demo store, it scores 70 for mobile speed and 81 for desktop speed, 84/84 for SEO and 88/88 for accessibility (mobile/desktop, 0–100). Those are medians across its 4 tested presets; mobile speed across every tested page ranges from 50 to 91. On its marketplace it is rated 4.5 out of 5 from 82 reviews.

Mobile84
Boost home page on mobile
Desktop93
Boost home page on desktop

Scores

MobileDesktop
Speed7081
SEO8484
Accessibility8888
Best practices9696

Median of 4 presets · measured 120 times since 2026-11-06 · Lighthouse via PageSpeed Insights · 0–100, 90+ is good.

Why not 100 — Blossom home page

Mobile

Speed 84 · 16 points to gain

  • −13.3 Largest Contentful Paint medium effort
  • −1.5 Cumulative Layout Shift medium effort
  • −1.2 Speed Index medium effort
  • 450 ms Reduce unused JavaScript high effort
  • 240 ms Reduce unused CSS high effort

SEO 92 · 8 points to gain

  • −7.7 Links do not have descriptive text low effort

Accessibility 88 · 12 points to gain

  • −2.9 Elements with `role="dialog"` or `role="alertdialog"` do not have accessible names. medium effort
  • −2.9 ARIA input fields do not have accessible names medium effort
  • −2.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
  • −2.9 Links do not have a discernible name medium effort

Best practices 96 · 4 points to gain

  • −3.8 Browser errors were logged to the console medium effort

Desktop

Speed 93 · 7 points to gain

  • −6.7 Speed Index medium effort
  • −0.8 Largest Contentful Paint medium effort

SEO 92 · 8 points to gain

  • −7.7 Links do not have descriptive text low effort

Accessibility 88 · 12 points to gain

  • −2.9 Elements with `role="dialog"` or `role="alertdialog"` do not have accessible names. medium effort
  • −2.9 ARIA input fields do not have accessible names medium effort
  • −2.9 Background and foreground colors do not have a sufficient contrast ratio. medium effort
  • −2.9 Links do not have a discernible name medium effort

Best practices 96 · 4 points to gain

  • −3.8 Browser errors were logged to the console medium effort

Presets and pages

Preset / pageSpeedSEOA11ySpeedSEOA11yTested
mobiledesktop
Inspire demo ↗ 768289788289 2026-11-07
category ↗ 74100909210089 2026-11-07
home ↗ 915491995491 2026-11-07
product ↗ 639286449286 2026-11-07
Blossom default demo ↗ 719588809588 2026-11-06
category ↗ 77100909310089 2026-11-08
home ↗ 849288939288 2026-11-06
product ↗ 519286559286 2026-11-08
Flourish demo ↗ 698488838488 2026-11-07
category ↗ 81100909910089 2026-11-07
home ↗ 766188946188 2026-11-07
product ↗ 509286559286 2026-11-07
Boost demo ↗ 658488818488 2026-11-07
category ↗ 70100909110089 2026-11-07
home ↗ 746188976188 2026-11-07
product ↗ 519286559286 2026-11-07

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Boost: mobile speed 70 on Themestested
<a href="https://themestested.com/theme/shopify/boost"><img src="https://themestested.com/badge/shopify/boost.svg" alt="Boost speed score on Themestested" height="20"></a>

Add ?device=d for the desktop score, or ?metric=seo / ?metric=a11y for SEO or accessibility.