PageSpeed: Defer Offscreen Images

Pages with images that are hidden or offscreen that are wasting bytes and reducing page speed.

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 images on the right-hand side.

Bulk export the pages and images via ‘Reports > PageSpeed > Defer Offscreen Images’.

What Triggers This Issue

This issue is triggered when pages contain images that are hidden or offscreen but are still loaded, thus wasting bytes and reducing page speed.

How To Fix

Consider lazy-loading images after all critical resources have finished loading to lower Time to Interactive.