Hello,
I have recently noticed that libnfs appears to be too slow to handle high bitrate bluray files. The performance seems to be barely below what is needed. I have a server running Fedora 25, and I was able to play the file flawlessly both using my smartphone as a client, as well as mounting the nfs share natively (by calling mount via command line).
I also found a discussion on github where some improvements to libnfs were being discussed [1], was there any further progress made?
[1] https://github.com/sahlberg/libnfs/issues/108
ETA: network graph when using native mount:
network graph when using libnfs: