Guide️

"Image elements do not have explicit width and height" means that your webpage is not setting explicit width and height attributes on image elements, which can cause layout shifts as images load.

"Reduce the impact of third-party code" means that third-party code on your webpage is slowing down your site.

"Ensure text remains visible during webfont load" happens when your webpage is displaying invisible text while webfonts are loading, leading to a poor user experience.

"Avoid an excessive DOM size" means that your webpage has a large Document Object Model (DOM) tree, which can slow down your site.

"Properly size images" means that your webpage is serving images that are larger than necessary for their display size, leading to wasted data and slower load times.

"Remove duplicate modules in JavaScript bundles" is when your JavaScript bundles contain duplicate modules, which can lead to unnecessary bloat and slower load times.

"Reduce unused CSS" means that your webpage is loading CSS rules that aren't being used, which can slow down your site.

"Avoid serving legacy JavaScript to modern browsers" means that your webpage is serving older, transpiled JavaScript code to modern browsers that support newer, more efficient syntax.

"Reduce unused JavaScript" means that your webpage is loading JavaScript code that isn't being used, which can slow down your site.

"Defer offscreen images" means your webpage is loading images that aren't immediately visible to the user. This unnecessary loading can slow down your site.