Nope no tweaks, perhaps you could get a lil GX260 Dell on Craigslist for 50 bucks, they are very common, if you get one that has a slower processor and RAM I have spares I can help you out with.
I recommend you get something around 2 GHz, 1.8 should be fine. I am looking to upgrade to 2GHz, I already have the processor I just have to pull the PC out of my cabinet and I dont feel like it at the moment.
If you get an AMD 2 GHz like a Semperon, in my experience, they will run a lot better in this type of application, but I am using the Intel P4 because that is what I got my hands on.