Double check that Jumbo Frames is off.
My router MTU is set to 1500 - I assumed that is sufficient, but let me know if that’s not the case
No, that’s pretty standard and you should be good.
That Router has a QOS Gamer option. I would double check to make sure that it is turned OFF. Just a couple of things off the top of my head.
Also, You could try attaching the PS directly to the Mac to eliminate the network and Aries completely as a source of the issue.
All QoS settings are off.
My Mac is far from the DAC, so Ethernet / streamer is really only option, and in fact this setup works extremely well; w/ the exception of Roon, that is… 
Have a look at the settings- setup tab, like this,
Does it indicate anything like analysing track x of y?
SJB
No indication of any ongoing analysis…
But …
I have just re-launched it and am observing the CPU usage during playback. Unlike previously, it’s steady at ~ 12%, no more spikes to 50%.
Could it be that there was indeed some background analysis that went on for days and just ended? This library is not particularly big - just ~ 500 albums / 8k tracks so it’s surprising the processing would go on for multiple days…
I will watch this over the coming days & see how it evolves.
Thanks all for the help.
Indeed “turning it off and on again” does seem to cure a huge amount of symptoms!
Glad it seems sorted, enjoy your trial, it’s a great product.
SJB
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