In our eyes the VM resources are not maxed out.
Only the gis server is under pressure and run at 100% cpu, then a spezial service with a Server Object Extension is working.
The service generate a print pdf. The DB-Server is only by 30% and has nothing to work.
On the GIS-Server are only mapservices and some featureservices, total 30 services. The Configuration of active instance and
max instance are only by 2/3 or 1/2. (Ram 32GB Xeon E5-2667 v4 3.2Ghz)
Our IT is thinking, that the ArcGIS Server benefits from a dedicated GPU in the VMware ESX Host.