Can i EDIT MU FILES SO I COULD MAKE IT RUN FASTER?

I HAVE A PENTIUM 4 1.5GIG O/C to 1.7GIG With 512MEMORY Nvidia GeForce 5600XT256MB 128BIT old 40GIG HD ... when i play MU ONLINE its kinda SLOW as in the same as my other PC thats only CELERON 1.3GIG 512MEM Built-In128MB Video..in addition MY Board is a P4S533-X which only has AGP 4X my Card is 8X also have 300W of Power i know that 4X is not that fast but i also know its fast enough for MU ONLINE...Thanks for any REPLIES