LMS memory and CPU usage on RPI 3

> Plus, I'm surprised that it seems to use a lot of memory : physical
> memory (1G) is usually nearly full (about 900 mb used) and it also uses
> some swap space (about 100 mb) stored on the OS SD card.

Which process is using the most memory? You're running QEMU to run a
Java application. I bet this is eating quite a bit of it.

Try to strip down your installation to a minimum. No Erland plugins. No
MusicIP. etc. Check results. Then add them back one by one. After every
addition check memory usage again.

--

Michael