You know, it goes without saying that partitioning make a graete performance. Look:
-your data will be better protect, if it's on separate partition. (If something happen with it, you could easily contain the damage partition in a single);
-allows you to organize the information more efficiently with smaller directories. Quicker searches for files or directories also result because the computer only has to search a single partition instead of the entire large disk.
I almost sure that you'll note by yourself, that your PC become better running.