[ TIP OF THE DAY ] Virtual Machines CPU performance issues running in the ESXi Hosts.

You're experiencing some of the following performance issues in the Virtual Machine (VM).

- The guest operating system boots slowly
- Applications running in VMs perform poorly
- Applications running in VMs take a long time to launch
- Applications running in VMs frequently become unresponsive
- Multi-user services can handle less simultaneous users than expected

These might be caused by virtual machines CPU performance issues running in the ESXi Hosts. To test the performance of an ESXi host in the form of memory, CPU, and network utilization, ESXTOP tool is used. It is a very good tool available for VMware administrators to troubleshoot the performance issues. For configuring ESXTOP, you’ll need vSphere Client and putty and SSH session should be enabled.

For CPU performance testing, %RDY, %MLMTD, and %CSTP counters are used.

Check the virtual machine's virtual hardware settings and make sure that you have provided enough resources to the virtual machine, including memory and CPU resources.