ES
navigate Enter open Esc close
WPO & Rendering Speed

Render-Blocking Resources Detector

Scan any URL HTML to detect synchronous CSS and JS scripts in the head that slow down FCP and LCP.

How to eliminate render-blocking resources?

Adding defer or async to scripts and converting non-critical CSS to preloads prevents browsers from pausing screen rendering before showing content to users.

Share this tool

Help others by sharing this free tool.