What is your network connectivity? Per this document you need - https://www.vmware.com/files/pdf/view/VMware-View-5-PCoIP-Network-Optimization-Guide.pdf 2Mbps per simultaneous user running 480p video, depending upon the configured frame rate limit and the video type.
I think you will have to look from your network side and adjust the frame rate via GPO for PCoIP
We have both 100Mbps and 1Gbps, most clients on 1Gbps. All in full-duplex.
Thanks for this guide. It will be helpful.