It appears that a single vCPU virtual machine in a resource pool called Production is available in having performance problem because it does not have enough CPU Resources.
"Which two methods can be used to improve performance and reduce CPU contention of this virtual machine while maintaining compatibility with DRS? (Choose two)
Configure a CPU reservation for this virtual machine.
Dedicate a physical CPU to this virtual machine.
Increase the share priority setting for this virtual machine.
Increase the share priority setting for the Production resource pool