Included in free:

+ Database cleaning
+ Site caching
+ Image compression
+ Auto optimize database
+ Automatic clean-ups
+ Displays database table statistics
+ Mobile device friendly
+ Enables/disables trackbacks and comments
+ Retains a set number of weeks data during clean-ups
+ Automatically cleans up auto draft posts
+ Enabled for administrators only

Premium only:

+ Multisite support
+ Advanced optimization options
+ Remove unwanted images
+ Optimize individual tables
+ Scheduling
+ Enhanced logging and reporting
+ Multilingual and multi-currency compatible caching
+ Premium support

Get free version

Get premium version