can't stream in hi-res on Roon HELP

@fuzztone I have a mesh WiFi system with three "nodes" spread through the house.  My Roon Core is my iMac (desktop) and it connects to the internet via WiFi.  My main system is connected directly to the router with an ethernet cable as the main system is located where my cable enters the house.  My downstairs system has an Sonore uRendu connected via ethernet leading to a chord Qutest leading to my preamp.  The upstairs system is a blusound node2i connected to the network via WiFi.  Perhaps I need a mesh 'node' that is located closer to my office where my computer (roon core) lives?

Are your Roon core and endpoint both on Wifi?  This may be your problem.  You need wifi bandwidth TO the core, back from the core and to the endpoint.

@erik_squires The core is on WiFi.  My downstairs system (endpoint) is connected directly to the router.  The upstairs system (endpoint) is also on WiFi.  I don't have a WiFi mesh node in my office by the computer.  Perhaps that is why hi res works fine through the bluesound app but isn't working well on Roon?  I know ideally I should have everything connected directly through ethernet but it's just not practical in my house.  Maybe putting a mesh node in my office will help?  It would be a hell of a lot cheaper than getting a new computer to be my core.  The argument against this is that I'm running the speed test from my office computer (Roon Core) that is connecting via WiFi and I'm getting 56 Mbps which seems ample for hi res streaming

Did you use a wifi analyzer? Get one for your phone and make sure your router channel(s) are not contested.

Possibly your core does not have enough processing power. I had this issue with a MacMini and then went dedicated server