Minimizing the plugin is always a good idea, agreed. However, this particular plugin shouldn't affect the frontend atall. Don't quote me on this, but I am almost sure they have is_admin() check before loading (loading as in modifying the html output of the post editor page, as well as loading the JS resources) the plugin to check that it is the wp backend. The function/class would probably still be loaded in your RAM, but that's negligible compared to what people normally use for the wp projects.