I can’t really comment on the granular module as I only tried it very briefly. All about the loopers at the moment.
CPU does fill up. For example, you can use 4-5 loopers, delay, reverb plus some modulation, VCAs and a mixer. The different reverb and delay type use different amounts of CPU. So eg clean delay is lighter than the tape emulation.
So far I made only patches that include everything I need as I used it in small setups to really get to know it. But once I integrate it in my main setup, I will leave delay and reverb to other devices and let ZOIA do things the others can’t.
And yes, both channels can be processed separately.