Please see diagnostic uploads 1206135147 & 881107557. Changing speaker group can take minutes -- very slow and unresponsive. No issues with music stream. This is a relatively new issue (several weeks or months). I say relatively new because I've had sonos for many years and never had these issues. There have been no changes to my network and all other devices on my network without issue. I've rebooted all 14 devices and taken down / restarted my network. Network test / speed test looks reasonable (10Mbps - 20Mbps for sonos devices).
Side note, I tried to contact tech support from app and rhe only option was chat, forum or phone call -- else I would have emailed tech support. Would be nice if submitting a diagnostic upload created a ticket and an email.
Thanks