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

https://blast-wiki.win/index.php/JPEG_vs_PNG_vs_GIF:_Which_Should_You_Use_on_Your_Site%3F

Optimizing images is the easiest way to boost your site’s speed and search visibility. Start by renaming files with descriptive, relevant keywords instead of generic strings, and always add helpful alt text for accessibility