What platform, what storage and how large is the directory? Might be a difference in experience for people on Windows trying to open N-TB over a NFS share compared to Linux N-GB locally.
That was a Windows laptop, local SSD, about 200gb of raw files (fuji, pentax) from this year so far. Plenty of ram, plenty of spare storage, but no discrete GPU which might have been the issue. I might try it on Linux at some point.