Do you think that this is something that could be fixed changing the router parameters? maybe it’s a silly question, I am not sure if AirPlay send the signal directly to the receiver or via router. Or is strictly WXC-50 depending…
There is only one way to find out, using an iPhone with earlier version of iOS (maybe iOS 14.6 ... 13).
I'll try to see if there is a way to downgrade the iOS 14.7 ...
I don't think it would be relevant because, you're not using WXC-50, you are using the Apple TV3, right?
If you follow the Shairport-sync issue threads on GitHub, Apple sometimes tweaks minor parameters of how they send Airplay 1 data with various OS updates. Sometimes they requires minor updates to Shairport-sync.
Apple should not make changes that break any of the official Airplay receivers or ones built using the officially licensed third-party development sources. If they have, they'll see it as a bug and it'll probably get fixed soon. If they break Shairport-sync, they won't consider it a bug and it's up to the vendor to fix.
My Cambridge streamer/amp have about 0.3s delay from changing the song. The same with my Marantz. It is tolerable. The Yamaha about 1-2s. Way too much.
A short update,
I've done a test AirPlay-ing from AppleMusic to a Sony TV (AirPlay add-on installed) using the same iPhone7 (iOS 14.7). The issue was replicated which guide us to the conclusion that it's not about the streamer WXC-50, most likely an iOS 14.7 (wifi buffer?) issue.
The issue was replicated which guide us to the conclusion that it's not about the streamer WXC-50, most likely an iOS 14.7 (wifi buffer?) issue.