Assassins Creed 2 is notorious for being resource-intensive, and particularly for my computer, it's bad. Even tweaking down the ingame settings to the lowest, lowering my resolution to the min, I can only run the game at a very unstable 10 fps.
Is there any way I can modify any files to give me some sort of performance boost?
I regret to inform you that there usually are very few magic tricks one can use to gain extreme boosts in performance. I am no tuning expert but when your computer struggles to even maintain very low amounts of frames per second there is simply not enough computing resources to go around and as a consequence, very little room for any optimizations. From your comments it sounds like your processor is the bottle-neck, and to increase speed would require you to disable CPU-intensive processes within the game, which may not be possible. Reducing your graphics settings may not have any noticeable effect on fps if your GPU manages just fine.
Therefore I would recommend you to get a computer, and if that is not possible, play some less CPU-intensive games until you possess the funds to acquire a new computer.
