guess the days of daughter boards and removable graphics chips died out long ago!?! From a laptop manufacturing view they wanna sell you whole new systems, not upgrade them?
How do you want to improve game performance?
load times = HDD dependent, but a little sd card with readyboost might help.
fps = unfortunately you going to have to play games at less than high settings to get the highest frames out of your laptop.
IF your laptop has access to the soDIMM ram slots on its underside, you 'could' get more RAM, but you would need to check what your laptop supports, and how much you can add (and it will cost).