I know that there are (at least one: Where can I find a dark stylesheet for mathematica?) previous posts about how to change the appearance of Mathematica, but they haven't been much of a help for me. The first set of questions are regarding style sheets. Suppose that I set up mine, or I use an already existing one (such as the one in the question above), can I enable it so that mathematica always functions based on that? Is it going to make its responsiveness slower (because it will always have to load more than the default style for its appearance)?
What I aim is changing everything into a shade of black, but also taking care for the cursor, etc properly so that they aren't hidden by the background.