The VDI plugin for Lync 2013 allows using Lync 2013 (which automatically becomes SFB after some updates are installed) over a remote desktop connection without performance penalties, by offloading the audio/video processing to the RDP client.
But what to do if you are using Office 2016 and Skype For Business 2016 on your virtual desktops / terminal servers?
According to the official Microsoft documentation here:
Using the Lync VDI plugin should work with your Skype for Business 2015 clients. But Microsoft recommends using the new HDX RealTime Optimization Pack solution in new deployments.