Thanks for the report. I'm not running LMS but still good to read up on your findings as it applies to other music server and streamer software.
As a streamer it makes perfect sense that RPi performance beyond a certain level doesn't offer any advantages. In fact, many of us under clock our RPi4 streamers which actually REDUCES its performance but not to a level that affects streaming. The under clocking potentially reduces digital noise and runs the RPi4 cooler w/o needing a fan.
So going with the RPi5 as a streamer is going in the wrong direction IMHO. That's why the RPi4 remains as my streamer while my RPi5 is used for other non-audio related tinkering.
My 'headless' Raspberry Pi 4 network streamer running Roon Bridge
