Hmmm...so the way to optimise your computer for audio is to buy a Mac because the guy who wrote the FAQ has only ever used Macs....
Frankly, both Mac and Windows can work just fine for home studios. You probably get a lot more computer for your money by buying (or building) a Windows based machine but you have to be prepared to dig a bit deeper into the OS to get the best out of it. The strength of Windows is the huge base of third party hardware and software out there you can use. The weakness of Windows is the huge base of third party hardware and software. Apple keeps a far tighter rein on things that can run on their gear--ups the reliability but also cuts choice and ups the cost.
Other things in the article:
He mentions 2 GB of RAM as a minimum. I'd say that's a bare minimum and will quickly run out of steam as you add tracks and effects to your mix.
He mentions having 2 HDD running at 7200rpm and I agree with that. However, they don't have to both be internal. Run your DAW software on the same drive as your OS is on but your tracks can just as well be on a USB2 or Firewire (or I guess Thunderbolt now) external drive.
However, all the above is more about buying a computer for audio than optimising it.
Focusrite has an excellent section on their site for things you can do to actually optimise the performance of your
Windows 7 computer to do audio. The link is
HERE. The tricks there really do make a big difference to audio performance. If you're on a different version of Windows, Googling for "Optimising Windows XX for Audio" will find similar pages for your version.
Similar applies to Mac operating systems. There are lots of little tricks you can use to get the best out of your computer. There are lots of suggestions
HERE. I do like how it starts our with some Macheads saying "just turn it on and it'll be perfect" then lots of more knowledgeable people come in with genuine optimising tricks. FYI, the theatre where I freelance sometimes uses a Macbook for sound playback (on Qlab) and they've used most of these tricks to improve the stablility and reliability of the playback system.