PageSpeed: Eliminate Render-Blocking Resources

Pages with resources that are blocking the first paint of the page. Lighthouse flags pages which have scripts that do not have defer or async attributes, and stylesheets without a disabled attribute, or media attribute that matches the device.

How to Analyse in the SEO Spider

To populate this filter the PageSpeed Insights API must be connected via ‘Config > API Access > PSI’.

View URLs with this issue in the ‘PageSpeed’ tab and filter and use the lower ‘PageSpeed Details’ tab to click on the issue on the left-hand side, and see details of the render-blocking resources on the right-hand side.

Bulk export the pages and resources via ‘Reports > PageSpeed > Eliminate Render-Blocking Resources’.

What Triggers This Issue

This issue is triggered when pages contain resources that block the first paint of the page.

How To Fix

Reduce the impact of render-blocking URLs by inlining critical resources, deferring non-critical resources, and removing anything unused.