Linux much faster than OS X for statistical calculations

Jasjeet Sekhon compared OS X, Linux, and Windows using his statistical software.
With equivalent processors, Linux did much better than Mac OS X.
The slowness of Mac OS X can be attributed to its kernel, which is built so that the operating system runs as a separate process, but that unfortunately slows down the overall speed.
Of course, you should take these benchmarks with a grain of salt, as they are for a very specific situation.
However, this could add credit to the rumour spreading that Apple plans to change the kernel in the next evolution of the operating system.