It's the % of Total Memory you should be looking at (See my Screenshot), not % of CPU usage, together with the iClone Kb usage (See my Screenshot) & the number of Running Processes.From my Screenshot, you'll see that my Total Memory usage is 37% with 44 Running Processes.
I have 6GB RAM. iClone is taking-up approximately 1GB of that. So I have plenty of spare RAM capacity.
I have a 64Bit OS, & since iClone will access upto 4GB RAM with a 64Bit OS, I could in theory Import a number od additional Objects into my Project.
If you have a 32Bit OS, iClone will access upto 2GB RAM. If I Opened my Project in iClone 32Bit Version, I would still have 1GB spare RAM.
If iClone is stating that you have insufficient RAM, you could end some non-essential Running Processes, to Free-up additional RAM. There's a Free Download Program; Enditall, that will automatically do that for you (But you would use it at your own risk). I don't have it, because I don't need it, with the System in my signature. Those with a marginal System, do.(IMO, your System is marginal, especially the CPU & amount of RAM, which "Could" be the cause of your problem).
The above is a brief description of the processes involved.
I'm afraid I can't give you precise instructions re; hoew to Fix your particular Problem. Reallusion's Forum Rep; Peter Edwards might. Send him a PM, referring your Thread.
Good luck
Anyone-else?