Heavy images are the silent killers of WordPress performance. To boost speed...

https://front-wiki.win/index.php/Do_Captions_Help_Google_Images_Ranking%3F_(And_How_to_Actually_Do_Image_SEO_Right)

Heavy images are the silent killers of WordPress performance. To boost speed and search visibility, start by renaming files with descriptive keywords instead of generic strings. Always include helpful alt text for accessibility and better indexing