Only in theory. See Roon 1.3 (Build 234) Is Live!
Today’s release of the core includes a re-design of RAAT’s audio streaming protocol that uses TCP instead of UDP to transmit the audio stream.
In day-to-day life, most of the protocols you use are TCP-based–browsing the web, viewing Netflix or Youtube. Streaming audio using TIDAL, Spotify, OpenHome, UPnP, MPD, or SMB. The two most popular UDP streaming systems that most people have contact with are AirPlay and Skype.
We have decades of experience building audio streaming protocols around UDP, and it has generally been our first choice, but we also know that both TCP and UDP, when implemented properly, are suitable for high-bandwidth, high-quality media streaming, so it was worth undertaking an exploration of “the other side” to see if there was actually a reason to consider switching.
After a series of experiments and prototypes, and a detailed exploration of both approaches, we found that we were able to extract more performance and reliability from TCP, so we took it to the next phase and started experimenting with TCP in our alpha environment a couple of months ago.
We found that using TCP reduces CPU load on the audio device and in the core–primarily by reducing the context switching overhead associated with “waking up” for each packet. Using TCP also allows us to offload work associated with re-assembling the packetized audio stream from RAAT to the operating system kernel on the audio device, where it can be implemented more efficiently and simply.
We also found that TCP is a lot “friendlier” to poor networks and routers. Not all router manufacturers perform extensive QA with high-resolution UDP audio streams, but they all test to make sure Netflix and Youtube (both TCP-based) work. TCP is also less likely to create trouble with exotic network setups–managed switches, jumbo frames, etc. If you have experienced trouble with these, it’s definitely worth taking another shot to see if the new protocol is easier on your network.