What graphics care you have? I've got a macbook with the gma 950 and when I run parallels with dx on it crawls! If I turn of dx is runs fine so I just run parallels w/out dx and then if I need it I boot up into windows with boot camp. I think its awesome I can run the same windows on parallels/boot camp.

I'm wondering how well multiplicity would run with coherenece, something I should try out if I get the chance, cause that could be awesome!

Chipset Model: ATY,RadeonX1600
Type: Display
Bus: PCIe
VRAM (Total): 128 MB
Vendor: ATI (0x1002)
Device ID: 0x71c5
Revision ID: 0x0000
ROM Revision: 113-xxxxxx-139
EFI Driver Version: 01.00.139

I think MacBooks (non-Pro) use shared memory for graphics. That might be the reason.

Parallels with DirectX works perfectly fast on my iMac. Haven't tried it on my MacBook and probably won't. I also don't use Boot Camp. If it doesn't work under Parallels, it doesn't work. I am not going to reboot to play games like in the OS/2 days.

Multiplicity with Coherence will probably display the normal Windows desktop that would be there if it wasn't for Coherence.

More likely because Intel's video chipsets (excepting the very latest) run T&L in software on the CPU, rather than on the chipset.It's better than 'pure' emulation since it's done at a lower level, but it's still emulation and as such is going to be slow. Even worse when using it in a VM.

It's better than 'pure' emulation since it's done at a lower level, but it's still emulation and as such is going to be slow. Even worse when using it in a VM.

Is Windows usually slow on Intel's video chipsets? I doubt it. Why would it be worse in a VM (especially since we are talking direct hardware access here)? No, I think it is simply the DirectX support implementation of Parallels that requires a real graphics card and not just shared memory.

It's got nothing to do with Wwindows itself, and everything to do with DirectX. Without dedicated graphics hardware (Hardware T&L, particularly), anything needing T&L (most Direct3D games) is going to be much slower than it would with a 'real' graphic card or chipset. As such, Intel integrated graphics are pretty poor even under 'real' Windows. And running with a virtualization layer may not make a huge impact, but it certainly won't help performance.