As my name suggests I know next to nothing about the internal workings of a pc. Despite having a fairly good pc I've never been happy that it performs at an acceptable level, but I have no idea how to test its performance. I have used on-line tests from companies trying to sell their wares and apparently my pc isn't set up to run at its optimum internet speed. Is this a case of the company just selling software or are there things that can be tweaked? Any advice you can give on setting my pc to work at its optimum level will be gratefully received.