Do the VM's in the resource pool reach the limit set? If not, are the virtual machines utilizing 100% CPU when running the analytics in their current configuration?
If the VM's are capping out the resource pool, more vCPU's will not change this constraint. Adding more resources to the pool would be needed before evaluating further changes.
If the virtual machines are not capping the pool, and they are not using 100% CPU utilization in the VM's. There needs to be a case made how spreading the load to more vCPU's will improve performance as well as the host needs to be reviewed for any constraints that could be causing an underlying bottleneck.
If the virtual machines are not capping the pool and are using 100% utilization, then there could be a need for more resources. This also requires a review of the environment for possible over commitment when adding vCPU's.