I've done a benchmark of compiling one of my GWT project in Eclipse four times. I still remember Turbo C can compile 10 lines of code per second, while Turbo Pascal can compile 100 lines per second when I was in university. Compilation is quite suitable for benchmark because it involves both CPU and I/O tasks.
|native in Ubuntu||82||81||80||79|
|in Vmware Player||112||107||108||108|
The Windows I'm using in virtual machines is Windows 7 Professional 32-bit. IDE is Eclipse for Java EE 3.6.2 32-bit for Linux and Windows. Virtual machine software are Oracle VirtualBox 4.0.8 and VMware Player 3.1.4, for Linux of course.
This is by no means a scientific benchmark, but what I got is if you plan to use a Windows guest heavily in a Linux host, VMware Player is the one to go with at the moment.