Parallels uses System RAM to mimic graphics RAM, and graphics RAM is MUCH faster. The other place where performance IS lost is the graphics RAM. But that extra 4 GB of RAM costs about $50. In BootCamp all RAM is available to Windows/Revit, so you need less.
You want to leave at least 2, and preferably 4 GB of RAM for the Host OS (the Mac), so if you need 8 GB for Windows/Revit, you are looking at 12 GB total. The last place Parallels impacts Revit is RAM. The more complex the model, the more Parallels will suffer when it comes to manipulating the model in 3D views, but updating a family with 50 instances isn’t going to be radically different. So Revit in Parallels is going to be just about as fast as Revit in BootCamp as Revit on a native Windows machine. You will notice a difference here between Parallels and BootCamp. Especially with shadows and ambient occlusion on. That is, other than 3D manipulation, i.e. And Revit is performance limited almost exclusively by the CPU. There is minimal performance loss due virtualization, at least with regards to the CPU. With any modern intel processor that supports VT-x the “virtual” processor will basically be the real processor. the later thread will focus on specific settings, techniques and such the Mac hardware, virtualization software, guest OS, etc. This first one will be focused on “Infrastructure”, i.e. I will be starting a couple of threads related to Revit on the Mac.
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