i wasn't very precise :
i am on a network of raspberry pi 4 with librelec 12.0.2 iirc
there is a router with dhcp on the network , but ip are fixed, and all machines are on the lan side of it.
i play local files that are on each pi, of synchronised loops
i get low values for ping ,
removed buffering , but still have a fluctuating start time ( different when pointer is displayed than when in "full screen"
thanks for any help. it would be a great anbd cheap solution for artists.