Bloated images are the silent killers of your site speed and search rankings....

https://sierra-wiki.win/index.php/WordPress_Generates_Medium-Large_768px:_When_Is_That_Used_and_Why_Does_It_Matter_for_SEO%3F

Bloated images are the silent killers of your site speed and search rankings. Start by naming files descriptively—no more "IMG_001"—and writing helpful alt text for accessibility