DRS will dynamically rebalance the workloads across the hosts in the cluster. You want to give the VM more CPU resources, your best bet would be to use resource pools - you will need to move all the vm's from the "root" resource pool into configured resource pools. But we need to be clear, this is not increasing the amount of CPU cycles - you cannot have any more processing power than the physical processors in the hosts , what you are doing is prioritising the VM's access to the available cpu resources and able to perform tasks such as limiting the low utilisation VM's to 1Ghz CPU, while the resource intensive ones can have the full physical CPU - 2.5, 3Ghz..etc
You could try giving the VM additional vCPU's if the applications support it.