Has anyone been able to sync large folders with syncthing? Last time I tried when syncing 500GB you'd end up using >500MB of memory which made it unusable for home NAS setups. Hopefully it has since improved?
This page indicates that your usage should be around 80 megs (with the gui closed): https://forum.syncthing.net/t/huge-ram-usage-2gb-on-synology... and that an unofficial NAS-specific build had a problem with high ram usage.