It is an easy fix and don't need a plugin. Just open the image, save it and resize according to the example below. After you have resized, replace that image in your site. Basically it is telling you that you don't need size bigger than this so you can reduce the load.
It is an easy fix and don't need a plugin. Just open the image, save it and resize according to the example below. After you have resized, replace that image in your site. Basically it is telling you that you don't need size bigger than this so you can reduce the load.