Pi 3 stuttering playback of DVD ISOs that play perfectly on Pi 2

sudo apt-get install iperf3

Then use iperf ideally against your NFS server (if you can install iperf on there with the following config (will test 10 minutes)
iperf3 -t 600 -c <IP of your NFS server>

Thanks for the suggestion, the stuttering coincides with using the 3 but I’m now seeing it more regularly with the 2 and so I’m suspicious of either the network or the NAS or, says quickly and quietly, OSMC. The NAS has had some updates in recent months and I haven’t had a reliable method of monitoring network speed to have a datum and comparison. Installing iperf3 on the NAS is something that I haven’t figured out how to do yet (Synology DS411j).

Has no one else experienced intermittent stuttering playback from DVD .ISOs on a NFS?