I would not worry about the CPU that much. I have a weak 2-core CPU processing ~30 folders at once, which would translate to 240 folders in your case, and the bottleneck seems to always be the storage anyway. I have never seen the CPU being pegged during the process.
On the other hand, if you have a very slow HDD, then there may be no difference in the processing speed between a 1-core and a 16-core CPU.