You have two VMs currently and you have a 4800MHz of CPU power for all them to share. and do not forget about ESXi...
that means you have a total of three devices running. All three of those things are trying to use a portion of the total 4800MHz that's available.
Just this in that way, check if there are option on which you can over provisioning options.
Regards
Basavaraj.R navalgund