It's pretty saddening (see screenshot below) how ill equipped After Effects is with maximizing CPU usage while rendering. I've run so many tests and configurations with the multiproccessing options in the preferences and have come to the realization it's not even worth using... the amount of time AE takes to set up all the processes, then to start and still have it only use 20%, etc... it's just not worth it. Often (because of third party plugins used in the comp) it will drop the MP rendering anyway because the plugins are not compatible.
At what point, Adobe, will you fix this?
Eden, please see Todd and my responses here:
Although we're not sharing specific details right now, the performance-related work we are doing will impact how After Effects utilizes multiple processor cores.
Thanks, Tim... so glad to hear this is being taken as a critical issue, because as you can see from my screenshot, it's utterly horrendous right now
Really looking forward to hearing announcements on this issue.