Features of SMUSH.IT

Optimize your images using an advanced lossless compression technique
• Set a maximum width and height where images will automatically scale before being added to your media library
• Asynchronously auto-smush your attachments for super fast compression on upload
• Manually smush your attachment individually in the media library, or in bulk 50 attachments at a time
• Smush.it images with no slowdown using WPMU DEV’s fast, reliable smush API
• Global and individual settings for multisite
• View advanced compression stats per-attachment and library totals
• Striping meta data from JPEGs –
• Optimizing JPEG compression
• Converting certain GIFs to indexed PNGs
• Striping the unused colors from indexed images

thank you so much for sharing this information. ans also some feature of SMUSH
Defer offscreen images with the flip of a switch.
Optimize up to 50 images with one click.