in answer to "is this an issue?"
um, lol, yes.. if you are not happy with it..
I would uninstall your
ps and reinstall it..
the problem could be caused from too many extras loaded in..lol.. I have to turn my cs on and go andmake coffee..
You may have more plugins installed than you realy want. when you reinstall only add the plugins you want.
You may have more brushes than you actualy use.. you dont have to pre-load all of your brushes. you can just keep your most used installed in the program and keep the rest of them in a folder and swap them from that.
I couldnt tell you if 5k of fonts is normal or not..I have never thought about mine..
your ram is fine, knowing how big your drive isnt a thing. .its how much of that 120 is free space..but unless your computer is absolutly choked with programs and things 120 would usualy be acceptable.
hope this helps