Here is XSI One million particle tests comparison posted on this site (http://softimagenews.blogspot.com/2008/10/results-are-in-xsi-beats-3ds-max-and.html).
That doesn't make any sense to me. He used shape operator and max calculates 1 million particles just in 2 secs on my stupid dual core machine. But takes time in rendering, as it treats to render polygone meshes of tetra shape. Not itself particles.
If used Krakatoa point renderer it will take same time as it takes calculating in viewport.
Senseless test. XSI can't beat in this test. Correct me if I am wrong.