Having posted that , I've found some enlightening information on avg/max LAN throughput figures in thsi article.
https://www.online-tech-tips.com/computer-tips/understanding-lan-network-transfer-speeds/

If you have a gigabit ethernet card on your computer, your router or switch is gigabit and the receiving device also has a gigabit ethernet card, your max transfer speed jumps to a much better 1000 Mbps or 125 MBps (125 megabytes per second).

Again, you won’t get that theoretical speed, but you should be getting anywhere from 70 to 115 MBps depending on the type of files you are transferring and your network setup.

most hard drives (SATA 3.0 GB/s) will max out at a read speed of 75 MB/s

His figures seem slightly lower than I'm getting for a SATA III HDD, but maybe 1Gbps LAN is more of a limitation than I thought?

I am using a rather long ( high quality Blue Jeans) hdmi cable, but I didn't think stuttering was a cable symptom. Wouldn't it just be 4K at 24fps for films?
I've done several bitrate tests and the built in file read test seems fine. But I can try moving box onto a short cable. Cheers.

I didn't have any issues playing 1080p SDR content but as I've recently bough a 4K (Philips OLED936) TV I've been playing as much 4K content via the Dune as possible and almost all at some point during payback experience a bout of stuttering several times at random points during playback and its got to the point where I'm going to have to abandon using it.

I can playback the same 4K content using TV's built in Media Player and Plex app without any issue, albeit they don't recognise the DolbyVision if in video track, just playing using HDR (Atmos is recognised).

The TV (which I can also connect with WiFi ac without issue) and Dune both connect using same ethernet to a NAS, so it can't be those.  I've tried using Plex app on Dune but nothing at all plays with that.

Dune is on latest f/w.

I notice under the Android System Preferences there seems to be performance/network related settings but don't seem to make any difference. 
Playback with less reserved buffers: disabled
Performance CPU mode: enabled

Under normal Video settings I have everything set to Auto (DV etc)

Under Playback Preferences , theres a HLS/Bandwidth: Auto  (should this be set to high ?) again makes no difference.

So I don't know if it a basic Dune player issue or if it's the use of Dolby Vision that causing the stuttering?
Sometime I can "fix it" by stopping, waiting 30secs then playing again and it'll get past the stuttering, but you can imagine doing that a dozen times, is frustrating and impractical.

Either way, the family insists we never now use the Dune, which makes it not fit for purpose.

Has anybody had this stuttering or any suggestions ?

I was on the latest stable and it did that, updated to R18 Alpha last night and same issue.

On the plus side, the GUI overhaul looks decent.

If it was working, would the android app (Plex) be able to use the DV VS10 engine features or is that reserved for the internal Dune player ?

Does anyone have Plex working on latest stable or Alpha f/w ?

Thanks

Hi,

I've just bought the Vision 4K and updated it to latest stable f/w, I thought I'd try that out before attempting to flash the new GUI Alpha.
I've previously owned a Dune TV101, cracking little box so I'm familiar with the UI, but I can see its been developed much further than what that had.

Couple of early user questions:
Although I don't yet have it connected to a 4K TV , that's hopefully coming in a couple of weeks  (Philips 65OLED936), so using it in 1080p via an AV amp (can only do 1080p also).

Problem with Plex
I use Plex on many different devices for myself and family, I installed the android app and it connects to the Plex server and the frontend all seems to be working fine, but it simply won't play anything I select, I just get a blank / shaded screen with the whirring buffer/circle.

Checking on the Plex dashboard , I can see the Dune box is a registered device, but it doesn't indicate anything playing.
All the videos I've selected work fine on any other device. 
Any ideas what the problem might be?

Assuming I can get Plex working, does it use its own player or the Dune internal player ?
Will I be missing out on the Dunes ability to use the DolbyVision engine/bells n whistles?

If thats the case, I may just switch to using the My Collection.

My Collection:   
Does it auto re-scan any network source folder (SMB) or do I have to manually re-index all the time? as one of my source folders is constantly having TV/Films added and removed, so if thats not the case, for that folder I might have to revert to just viewing it in Favs.
This is one advantage of the Plex server monitoring and auto scrapping the folders, so would be nice if it did that.

That's it for now, any insight to those question appreciated.

PS. Thanks futeko for the prompt delivery service.