Hi @Bozon,
I am also running Roon core on a headless Ubuntu 22.04.2 server with 16 GB RAM installed. My database currently manages 270k tracks.
Here’s my current memory usage, after uptime of 18 days:
This has gone up until above 13G resident memory usage as shown in htop.
But… it does go down again, with a clear tendency to use as much RAM as available. And I don’t notice any negative performance impact.
What I did do, though, is to adjust the default ‘swappiness’ kernel parameter as outlined in a recent thread. Without any swap usage, the performance of Roon Appliance has been better than ever before.