Optimizing your images is the easiest way to boost site speed and search...

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

Optimizing your images is the easiest way to boost site speed and search rankings. Start by renaming files with descriptive, keyword-rich names and adding helpful alt text for better accessibility