In the quest for giving my Hyper-V images maximum performance, I stumbled across this blog article detailing how you can boot your physical box from a Hyper-V vhd file. Now all the RAM in my physical server can be given to the virtual machine. SharePoint 2010 can now get all the memory it deserves.
The article describes booting from a Windows 7 virtual machine, note that you must use either the Enterprise or Ultimate edition of Windows 7 for this to work, not Professional, otherwise a licence error will be encountered.