This plugin has been closed as of 2022年7月15日 and is not available for download. 原因：安全性問題。
This plugin minified my theme's CSS like this, but calc() property needs spaces between each operators. Before minify, this is correct:
Improved my rating in Pingdom to just A
outputs some warning,it is bad
php error messages from this plugin will make your admin area unusable, you will not be able to disable the plugin via the wordpress admin, so take care!