Maximizing vba CPU usage

This problem has been on mind for a while and I haven't read anything concreate about it so I thought I would poll the people here. How can we force a macro to use all our CPU capacity when running? I am running a quad-core, 64-bit Excel and my macros seem to only use around 25% of the avaiable CPU capactity. On the other hand, if I update a million cells with formulas in them, Excel flexes its musceles and sucks every last drop of processing capacity to its favor. Any thoughts? Has anyone come up with a way to simulate multithreading with vba?

abousetta

Does anyone have any experience they want to share regarding Excel DNA? Anyone know any good resources or documentation on how to use it? It looks like a good option to be able to harness multi-core functionality with vba but I am having difficultly following their examples.