I have personally moved to gdu (https://github.com/dundee/gdu) as I found it to be way faster than ncdu (I haven't checked the fork but I don't expect it to improve that much).
1 minute vs 1 second for my entire / which includes mounts to NFS shares (used 1.4 TiB on host SSD, 14 TiB on NFS HDDs and 3 TiB on NFS SSD).