Based on experience and advice from others, it seems that even with a 4-core CPU, it is still better to assign only 1 processor core to the virtual machine in Fusion. Anybody knows why?
That's not my experience. I've been running Virtualbox on the i7 CPU for several years and assign at least 2 processors to each VM, whether Windows 7 or Ubuntu. I find the VMs are more responsive with little to no impact to the host.
My rMBP has an i7 2.6GHz CPU with 4-core. So, I should assign 2 processor cores to the virtual machine in Fusion?
I assigned 8 out of 16GB RAM to the virtual machine. Is this an optimal setting?