Linux is just better in high memory, high load situations

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Same system (or roughly same specs), about 8GB RAM

Linux vs Windows vs Mac OS X

>Launch a VM and let it take almost all RAM
>Have high CPU usage
>Switch from the VM to the underlying host system
>Launch a heavy, graphical, memory hungry application like a browser
>Visit a site and let it eat memory
>Switch back to VM and do the same
>Switch back to host, etc

Linux stays responsive, the load is high but all programs run and the switching between application is instantaneous

Windows is awful, switching between applications take ages, leaving the VM is slow and the system is very unresponsive, very high disk usage too

Mac OS X is just slightly better than Windows but not by much (and it had slightly better specs). Still nowhere near as good as Linux.

Is Linux so much better in the stuff that a kernel is supposed to do?
Why proprietary OS vendors suck so hard?