SWYH or rather the used audio capture “device” WASAPI has little to none delay at all.
Blame Sonos for their way to decode mp3 frames when live streaming (http chuncked – most likely they use FFmpeg which wastes about 10 secs to get the mime type of the stream zZzzzZZZz). If you want a lower delay stream in wav / lpcm.
Just a note:
As long as you stream in mp3 a lot of devices will have about 10 secs of delay. Doesn’t matter if the sender is e.g. an Android device streaming via AirAudio or Allstream etc. and the receiver a Sonos box or Kodi or whatever.
You can check via a second PC and playing the live stream with vlc / windows media player: http://ipaddress:port/swyh/swyh.mp3. No delay at all…