Jon Snow wrote:

splitting up information into .sav files or just using one big .sav?

For a large game, lets say an Online RPG, small save files for each player or purpose it the way to go. Otherwise all the processing goes into tring to find a specific thing in a large file causing much lag. (You can trust me ;) I've tried). The only exception is most likly if its a small game that won't have many players, more like 1, or doesn't have much to save, which allows you to take the lazy man's way out of just using one.