I did this exact thing for these exact reasons.
Zero regrets.
The performance boost you’ll enjoy is on 6 fronts:
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It new hardware so it’s of course faster than what you currently have.
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Price-performance is better with PC. Whatever you get with the money you spend, it’ll be faster.
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Modern CPUs are very overclock friendly. Motherboards from, for example, ASUS, come with built-in overclock profiles that can be chosen with a simple menu selection in the BIOS. So your faster hardware will be faster still, because Apple doesn’t provide any tools to overclock. Can you overclock a Mac? Sure, but it’s tricky and unsupported. With the right Motherboard purchase from ASUS, they’ll actually support you OCing it. They have a phone support of technicians called “Overclock Engineers” (I’m not making this up) that will walk you through it for free. It has to be on their “OC Supported” list – so call them first and find out which ones are.
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Cubase performs faster, all things being equal (same hardware), under Windows.
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Windows ASIO performs better at low latencies than OS X Core Audio – this is well documented over at Dawbench (an old article but still applies)
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VST Plugins, by many 3rd party vendors tend to be more optimized than their AU counterparts. The affect of this can add up. I have not heard any complaints of the reverse being true, but there are probably instances.
The net effect of all of this will astound you.