Parallels Tuning

Hello Parallels team,

I am (still) trying to figure out the best configuration to run Parallels on my somewhat weak MB Air (late 2008, 2 G Ram, 1.6 GHz, NVidia 9400 graphics).

I've arrived at a fairly decent work speed with this setup:

-Run in full screen
-Assign 1024 MB to the VM (which runs Windows 7)
-Turn off Spotlight completely
-Set the audio driver to play audio at 11.025 kHz (somewhat muffled sound but no sound hiccups)
-Prevent most Parallels services at startup except the Parallels Tools service and Parallels Server/Desktop Runtime Switch

The speed is certainly better than that of a very thin Sony laptop running Windows 7 that I saw recently .

A few questions:
- What is the Parallels Server/Desktop Runtime Switch that I currently load at startup? What does it do?
- In the config.pvs, I've set foregroundPriority to 2, backgroundPriority to 0 (default: both set to "1"). Is this relevant or does it only pertain to situations where multiple VM's are running concurrently?
- In the config.pvs, I've set the ioPriority to 2 (default: 4). From various docs found via Google I think this pertains only to multiple VM's running concurrently but I'd like to know for sure :-
- Can you provide an overview of the config.pvs file?
- Parallels creates a memory dump file within the VM package. This seems to contain the VM's memory (the virtual memory file is apparently not stored on the VM's hard disk but rather directly on the Mac). However, when I turn off virtual memory in the VM, the file is still there. Why, what other information is stored here? Video memory? Is there any way to have the VM's virtual memory file stored in the VM's hard drive?

Thanks for any info,
and have a great day!