Optimizing your images will help your WordPress site load faster.
Download and activate WP Smush. This plugin will optimize every image you upload and you can use the Bulk Smush.it features to smush all of your uploaded images.
Alternatives to WP Smush.it includes EWWW Image Optimizer, CW Image Optimizer, Imsanity, and Hammy. Many WordPress users prefer using these plugins as they do not rely on an external server to process your images.