Is Command line more efficient than Graphical user interface ?

I believe that for most people GUI is better and they have all the information and options they need to hand. I think though that Command Line would probably use a lot less memory and resources and get the same job done a lot quicker. Whether that equates to better efficiency I don't know because most people these days don't know command line and are only familiar with GUIs and so it could only be more efficient for those that do know command line and all the commands. All things and factors being equal I think it would be more efficient.