Hi @noris :
– The core is on a Mac mini which is connected to my router with an ethernet cable
–The router is an Asus RT-AC87R, and I have not been using any switches or powerlines until only yesterday, when I started experimenting with a newly released Sonore OpticalModule FMC, with my Ultrarendu endpoint… I would like to emphasize, however, that I have been observing the slow playback issues I have reported for more than a week now, and that they do not have anything to do this experimenting with the FMC, which is exclusive to my Ultrarendu endpoint alone at any rate.
– I have that Ultrarendu I just mentioned, a Metrum Acoustics Ambre (the most used endpoint), An Oppo 203, a logitech Squeezebox Touch, The MacBook Pro from which I do most of my controlling of Roon, an Iphone, and a couple of ipads, all of which may serve as endpoints at one time or the other…
The problem can be observed on all of these endpoints (I have only tried a few of them lately, to be honest), but the severity of the slowness varies depending on the time… I have observed the worst of the problem when using my Metrum Ambre, but that is simply because it is the one I use most of the time. After reading your post, I tried the Ultrarendu endpoint, and also tried playing Roon on my iphone XR… The results were similar, although the degrees of slow-response varied from one endpoint to the next… The iphone was the fastest to respond, but it also exhibited occasional brief cutouts of sound, which was probably related to its wireless connection?
Finally, since yesterday afternoon, the slow response seems a little less severe on even the ambre (it is taking less time than it did on Sunday for the playhead to respond when one hits play in Roon, so the severity of the problem can vary with time, even for the same endpoint.