Change the Big Image Size Limit
Sets the size above which WordPress scales down very large uploaded images (2560 pixels by default), for example to 1920 pixels to save disk space and bandwidth.
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Delete Image Size Files No Longer Registered
Adds Tools > Unused Image Sizes, which finds resized copies of your images made for sizes your current theme and plugins no longer register, shows how much space they take, and deletes them in batches after confirmation.
Redirect Missing Resized Images to the Original
Sends requests for resized images that no longer exist, such as photo-300x200.jpg after a theme change, to the original upload, fixing broken images in old posts and on other sites.
Set JPEG Compression Quality
Changes the quality used when WordPress generates resized JPEG images. Lower values give smaller files; the default is 82.