Alternatively you can also use WP-CSS and WP-JS.
DO NOT use WP-CSS or WP-JS simultaneously with Wp-Minifier.
This plugin GZIP and strip whitespace from your CSS files.It then merges all CSS files into ine single file.This reduces the number the number of http requests and speeds up your site.
This plugin allows developers/designers to confidently use @import inside a CSS file and not worry about what happens on the user’s end. The plugin will look through your style.css file and put any @import files into it. It will also GZIP and set a cache expiry time.
Use Google Libraries
This provides numerous potential performance benefits:
* increases the chance that a user already has these files cached
* takes load off your server
* uses compressed versions of the libraries (where available)
* Google’s servers are set up to negotiate HTTP compression with the requesting browser
Note:Some of the above plugins conflict with Wp-Super Cache and other plugins.Please check the plugin homepage for more information on these conflicts.