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Insights

Performance

Core Web Vitals by platform, measured with field data and lab tests. This section covers what to fix first, how to prove a change worked and which numbers matter to visitors.

Guides

Shopify speed: theme, apps or third-party scripts?

Measure the same page twice: once as it loads, and once with third-party domains and app files blocked. The difference is what the outside scripts cost; what remains belongs to the theme and the platform. In our lab test, blocking cut one live store's Total Blocking Time from 6,291 ms to 1,129 ms. Shopify's own theme demos still showed 4 and 9 second LCPs.

Performance

Tools and resources

Core Web Vitals checker

Check a public web page for Core Web Vitals. See field data where available, a mobile lab run, practical fixes, and a shareable report with no email required.

Open tool

When you need a team

Related service

Speed Optimization

Website speed optimization for WordPress, WooCommerce, Shopify and Laravel: a fixed sprint on LCP, INP and CLS, measured in CrUX field data and lab tests.

The Build Brief

One email a month. The fixes, the numbers, nothing else.

What broke, what changed, what we measured, and the one thing worth doing on your site this month. Read in four minutes. Unsubscribe in one click.