To run it on systems with low memory, I suggest performing any custom builds on a separate machine. In "normal" circumstances you don't generally have to do an

To run it on systems with low memory, I suggest performing any custom builds on a separate machine. In "normal" circumstances you don't generally have to do any builds at all - (almost?) everything should come from the binary cache. To be doing all these rebuilds it sounds like you're customizing packages, which is already something other distributions don't tend to let you do at all.