Unraid SMB performance is very slow compared to SMB performance of a Windows Server VM running on the same Unraid hardware. I tested using 6.7.0. Test methodology and results are here: https://blog.insanegenius.com/2019/06/10/unraid-in-production-a-bit-rough-around-the-edges-and-terrible-smb-performance/   server-1-diagnostics-20190611-0254.zip