Well, I think I have to give up my dream of running Roon on my WHS 2011 system.
Streaming to Roon remotes connected by WiFi is unusable. Tracks just stop playing, usually after a few seconds. These Wi-Fi connected remotes are running on both Intel Atom systems (ThinkPad 10 and Surface 3) and an Intel Core i7 laptop (Lenovo Yoga 900).
On Roon remotes connected via wired Ethernet, performance is fine, no dropouts.
This is with RoonServer installed on a WHS 2011 system that has an Intel Core i3-4130T processor running at 2.90 GHz. True, it’s no speed demon, but it’s more than enough to run both Plex and Emby servers, our Home Automation system (Domoticz) as well as the WHS Media Server (NAS). During the Roon testing, no Plex or Emby clients were connected, although the servers were running.
I’ve now installed Roon Core back on my desktop PC (an Intel Core i5-4460 @ 3.20 GHz system). All Roon remotes are behaving; no dropouts. In fact, I’ve got all three WiFi systems playing albums simultaneously at the moment.
tl:dr - Roon doesn’t work properly on WHS 2011, and since it’s not a supported OS, I don’t think it ever will.