@marthaowen what 4Ghz CPU requirement? I don't see anything mentioned other than 2 vCPU cores in the documentation at

 

https://docs.microsoft.com/en-us/microsoftteams/teams-for-vdi

 

The important factor for Teams performance is to have the right versions of Citrix, VMWare etc. configured to allow the client to offload the audio/video to the VDI client. The server is taken out of the processing for the latency sensitive media workload, and you'll get basically the browser experience for a meeting superimposed on the virtual desktop, as described in the diagram in the above document.