Just like anything else, your Simulate ONTAP™ will run faster if you give it more memory. And while you should not decrease this value, you can increase it. Edit this file:
loghyr:nsim-1.vmware thomas$ vi DataONTAP.vmx
to bump it, e.g.,
loghyr:nsim-1.vmware thomas$ diff DataONTAP.vmx ../DataONTAP.vmx | grep memsize
< memsize = "4000"
> memsize = "1600"
Note that as you are running a cluster, you will have at least two of these running and your upper limit is the amount of RAM available to your host computer.