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

https://wiki-velo.win/index.php/Should_I_Use_Full_Size_Images_in_WordPress_Posts%3F_A_Technical_Deep-Dive

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