Render-blocking <script>Render-blocking <script>

Why it matters

A <script src> without async or defer stops HTML parsing until it downloads and runs (Lighthouse: eliminate render-blocking resources).

Fix

Use next/script (afterInteractive or lazyOnload), or add defer.

Credit

• GC

  From Google Chrome

  Lighthouse flags synchronous scripts and stylesheets that block first paint, and recommends async or defer.

References

• Eliminate render-blocking resourcesChrome for Developers
• <script> HTML script elementMDN Web Docs
• Efficiently load third-party JavaScriptweb.dev

See it

Related rules

• perf/script-strategyScript loading strategy
• bp/document-writedocument.write()