Slow Airplay connection for Apple Music on Sonos speakers

Hi there.

I'm having struggle to use Music (Apple app), when I want to play music via my Sonos speakers (airplay 2). It does take around 15 seconds to start playing the first Music tune. What can I do to improve this to use less time?

My Mac is on a 1Gb Lan, and my speakers are on WiFi 2.4Ghz from the same router.

[Re-Titled by Moderator]