Where to start?  There are a multitude of tools built into VMWare products. I'd start with vCenter Performance monitoring tool, or you could go really granular and look at ESXi host level performance metrics using esxtop.

If you have a vRealize set up then you will have all teh evidence in teh world of a poorly designed environment.  BTW what is a RFP??

A high level design on paper may help you get some answers from this community. There are too many questions outstanding about your storage and cluster design i'm afraid

Hi, @TAKESHI52 , @jc296 

The problem appears to be a very slow deployment of virtual machines.

In this case, disabling a feature in Horizon called View Storage Acceraration may speed up provisioning.

To disable View Storage Acceraration, go to "Servers" in the Horizon Console and edit the registered vCenter Server.

The View Storage Acceraration setting exists in "Storage Settings."

Also, if there is a problem with the master VM,
Install Windows Process Monitor on the master VM,
When deployment is slow, you can look at the CPU usage per process in the virtual machine to rethink which processes are needed.

Hi @jc296 
Thanks for the quick reply. We still don't know which is the problem host and client. Hence we want to investigate both.
Unfortunately, we don't know anything about "esxtop" or "vRealize" that you taught me.

esxtop：Using the esxtop Utility (vmware.com)
vRealize：vRealize Suite Documentation (vmware.com)

Are these as per your advice?
Thanks for the advice anyway. Confirm the tools you were taught. Thank you !

Hi, @yukiafronia 

Thanks for your specific advice, appreciate !
I'll try your advice.

We first want to prove that the pre-built environment does not meet our requirements. Are there any other good load testing tools besides what @jc296  taught me? Thank you.

Hi, @jc296 

Sorry, I forgot tell you what is RFP. It is our request for materials to propose construction based on the necessary items before defining requirements.

I'm guessing the slow response times for spinning up VMs concurrently could and probably is a result of your storage design so maybe do some monitoring of the underlying esxtop metrics. Good article here: https://kb.vmware.com/s/article/1008205

Duncan Eppings research is also excellent here: https://www.yellow-bricks.com/esxtop/

How is your shared storage designed? Fibre Channel, iscsci (Block) or File?

Hi , @TAKESHI52 

I would use esxtop and also Storage Performance Tester.
https://flings.vmware.com/storage-performance-tester

Hi @jc296 

Actually, We design shared storage with iSCSI.
I’ll check the URL you gave me. Thank you!

Hi @yukiafronia 

Thanks a lot ! Let me check the URL you gave me.