Serviio

What does -Xmx...m memory option in the "Supported system properties" do and how is it configured?

What will trigger memory shortages?
https://speedtest.vet/ https://vidmate.bid/
I have one server set to -Xmx1024m (twice the basic memory).
What impact/benefit does it have for performance, index handling, audio (including handling large hi-res files) or is it mainly for video impact.

What typical values could be used without wasting memory?
I cannot find any detailed guidance.

It is a memory setting for the Java runtime environment. Under most user conditions, it's not necessary to change the setting. Mine is at 512m, which I believe is the default. I've never encountered any issue with Serviio that might be related to memory issues.