I have spent years cleaning up neglected WordPress sites. It usually comes down...

https://sticky-wiki.win/index.php/Stop_Killing_Your_Site_Speed:_The_Best_Free_Tools_to_Compress_and_Resize_Images_for_Your_Blog

I have spent years cleaning up neglected WordPress sites. It usually comes down to simple maintenance. In this article, I show how to boost performance by compressing images and linking to your older posts