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Hi Andrew,
Are you really sure your RD-Server will be able to use all allocated CPUs. In my oppinion it is quite meaningless to entitle 8 vCores and more for a machine which uses less the 10% of them in average. Due to the mechanism how the hypervisors cpu schedular works a machine with low utilization but many entitled vCores will run fairly unsmoothly and stutteringly and this will result in bad user experiance. Allthough your host has enouth free cores the CPU readyness time will rise dramaticaly.
We e.g. provide many business applications for end users via Citrix XenApp. There are often more then 50 Users per XenApp-Server. Each XA-Server only has entitled 2 vCores. Its more then enough in most cases. There are only bottlenecks if there is a user session with an amok running application which wastes 100% CPU-Ressources. But in this case it might be regardless of how many vCores I asign.
There are ways to push down the readyness for such oversized VMs. But the better way is allways to size a VM sensable to it's workload. (As small as possible and as big as necessary).