I have recently purchased a Mac Book Pro (Mavericks 10.9.3) and I'd like to run Inkscape. After researching the subject I see that I need to install X11, however I don't want to do this if X11 is going to run continuously and chew up CPU resources. (Inkscape is the only X11 app I am likely to use, I think).
So, if I install X11, will it run whenever the machine is in use? Or only when an X11 app (such as Inkscape) is running. And are there other downsides/complications to running X11?