Ready, %RDY:
This value represents the percentage of time that the virtual machine is ready to execute commands, but has not yet been scheduled for CPU time due to contention with other virtual machines.
Compare against the Max-Limited, %MLMTD value. This represents the amount of time that the virtual machine was ready to execute, but has not been scheduled for CPU time because the VMkernel deliberately constrained it. For more information, see the Managing Resource Pools section of the vSphere Monitoring and Performance Guide or Resource Management Guide.
If the virtual machine is unresponsive or very slow and %MLMTD is low it may indicate that the ESX host has limited CPU time to schedule for this virtual machine
https://communities.vmware.com/t5/ESXi-Discussions/Understanding-RDY-CSTP-scale/m-p/1324089
The VM is waiting for the resource schedule on the physical CPU but stays on the ready state until it gets a turn to use the resources.
This indicates high contention. Many VMs are using the CPU.
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