I was reading what people have been experiencing when testing out DPC latency in Win 8 and found an interesting post on page 3 of this forum.
Enter this command in an elevated command prompt, reboot, and see if it helps:
bcdedit /set disabledynamictick yes
What it will do is stop Windows from coalescing CPU clock ticks when idle, a feature added in Windows 8 for power savings.
Can any of you 9ers who are running the final Win8 test your DPC latency and report them here?
Both using the default settings AND after setting "disabledynamictick" to yes and restarting.
dpclat.exe is the easiest way to get a simple graph and an indication of how good your computer is for working with audio apps that rely of low buffer settings.
This is what I used to figure out that one of my Ethernet adapters was messing with the smooth operation of music software on my computer. I ended up using the other Ethernet port instead and it's fine now.
http://www.resplendence.com/latencymon can give you some information about the performance of you Win8 machine too.
Decent latency is incredibly important when it comes to making music or anything that uses ASIO drivers and small-ish buffer settings.
There are websites dedicated to iOS music software and I've even seen special issues of magazines about them. If Win8 machines can't provide users with usable performance even in Win8 Pro in Desktop Mode I can't see anyone interesting in making music with touch enabled devices bothering with a Win8 tablet.