@WealthSmith Worth remembering that there are fast & slow CPU's and GPU's. I have a i7-4790K processor running at 4.4GHZ with 32GB of Ram and using 8 Cores it will plot at about the same speed as my Radeon R9-290X.
However yes generally a GPU will be faster plotting and Mining than a CPU. On my PC I tend to use the CPU for Mining while the GPU is simultaneously plotting a drive. Best thing to do is to experiment and see what works best for you.
Rich