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162 votesAnonymous commented
On some of the "better value" azure virtual machine types, such as the B series, CPU cycles which your VM doesn't consume is simply available for other VMs on the same host. Be reminded that the VM to host density at class B is already very high with vCPU to logical processor rates likely running over 30:1. When large enough numbers of machines are idle, whole hosts can be turned off to save even more power. Ever noticed how sluggish some of the azure hosted VMs are at class B?