Optimizing your images is one of the quickest ways to fix a sluggish site....

https://wiki-mixer.win/index.php/ShortPixel_Says_Up_to_80%25_Compression_-_Is_That_Real%3F

Optimizing your images is one of the quickest ways to fix a sluggish site. Start by renaming your files to be descriptive and writing helpful, relevant alt text for accessibility