Java6u1 (or any other J2SE release) much slower on Vista than on XP

I am writing a java based program that gets loaded via the the command prompt Java -classname. The applications runs many times slower on my new Vista install than on windows XP. Anyone have experienced this before? Any tips or suggestions in speeding things up?

If it will help, the application does a lot of math and uses contains many vector elements. It's a simple simulation of an AI technique.

The program runs very much slower, in Vista each iteration takes 3-4 seconds while in XP it can process 20-30 iterations in that same 3-4 seconds.

[566 byte] By [elhh82a] at [2007-11-27 1:04:38]