I tried a demo of this plugin and on my Imac (El capitan) it is very CPU intensive (30 %)
For comparison, It uses 3 times more CPU than Uhe Diva (10 % CPU).
It is a old 2007 imac but it runs fluently most of my plugins.
if the gui is closed, cpu should be better.
I get 1-2% on a i9 cpu with open gui, 5-6% while gui is open.
the „animate wt draw“ option is there to tame the cpu a bit. retina drawing is just pretty intense, plus all the VA circuitry.