What does "Preload Largest Contentful Paint image" mean? How can I solve it?
If you have tested your website on PageSpeed Insights or GTmetrix and you got the message "Preload Largest Contentful Paint image", it means that the image in question is being lazy loaded.
If you are using ShortPixel Image Optimizer, note that the plugin does not have any lazy loading feature integrated. Therefore you should check your plugins or theme and exclude the image from lazy loading.
If you are using ShortPixel Adaptive Images, like in the above example, simply go to Settings > ShortPixel AI > Exclusions and exclude the image in question on the "Don't lazy load" box.