I would take a look at the performance tab for each of the VMs. Looking at the counters below:
- CPU Ready - I would expect this to be a low number with your configuration
- Memory Ballon - You would like to see this number be 0
- Memory Swapped - You would like to see this be 0 also
Also you make sure that you have vmware tools installed on both of your VMs.
If everything looks good on the performance tab and vmware tools are installed on your VMs. I would start looking at the VMs themself and make sure the issue is not there. One place to look is to make sure you are not paging and check to make sure your CPUs are not maxed out on the VM.