Readiness check · Accelerate lane · weight 5

No render-blocking scripts in <head>

Every external script in the document head uses async, defer or type="module".

Why it matters

A plain <script src> in the head stops the browser from showing anything until that file has downloaded and run.

Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

Every external script in the document head uses async, defer or type="module".

Observed: Head scripts load without blocking.

Not observed: One or more head scripts block rendering.

Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

Next.js: Use the next/script component with an appropriate loading strategy.
WordPress: Since WordPress 6.3, scripts can be registered with a defer or async loading strategy.