There used to be a CPU percent value displayed at the top of the screen, but it wasn't correct. It seemed to always display more resources used than the Origin was taking. Apparently, building patches is a little more dynamic than we suspect.
I have been able to make really huge, involved patches using more than 20 modules, but as with my CS-80, stuck to having just 6 - 8 voices available. Having said that, I realize that having a programmable modular that is polyphonic at all is a godsend for me. And you can certainly make some amazing patches using just three oscillators and two filters. And as I stated above, you can stretch the Origin's polyphony by making the main body of a sound with name brand modules, and then adding in Origin modules for complexity and richness. Or just use named filters, since the filters are the major contributor to how a synth sounds.
Have the more basic patches to do the big chords, and you can certainly make some that don't sound basic at all, and then have the big modular guys for the melodies which use just a few notes. Heck, it's much better than the original Nord Modular, which when you began to reach the resource limit, you could only play two or three notes.