So I just swapped it over and it all boots but Libreelec says the CPU is a ARM7 Processor Rev4 (v71) Is that right?
Will it just see all the new hardware bits and work better?
The LE image is the same for 3B and 3B+. Hardware differences will be detected on boot sequence. Processor info is wrong, but it doesn't matters (you will have the extra speed, anyway). Your installation is fine.
I had installed Kodi 18.1 (Linux Kernel 4.19.x) on a thumb drive booted the NUC and it ran the installer I plugged in another 32 gig thumb drive on 3.0 USB to be the main drive it installed with no problem. When finished it asked to remove the original thumb drive with the installer and reboot. Everything works just updating the library is taking days ! And yes never had to do anything special with the Raspberry's to run my Library from my cloud using NFS
P.S. No crashes but a lot of freezing
I'm very sure the target USB device is the bottleneck. Try to install it on an internal drive (SSD or M.2).
Read the post on top of this sub-forum. It was made for you. 
Hmmm never done that before ?
OK, if you never did special router settings for the RPi, then it's probably no router problem.
OK I setup a Gigabyte NUC Intel Celeron J1900 Mini PCup to 2.42GHz with 4 gigs ram running Kodi 18.1 (Linux Kernel 4.19.x) off a USB 32gig Thumb drive.
I don't understand this. Do you run LibreELEC? Do you run an OS at "live" mode directly from an USB stick (that is slow for sure)?
So it appears its kodi.bin, its using around 49 % when just sat in the menu.
Any ideas?
See post #2 (it's a proof of my GUI theory)
Is there some tweaks I am missing ?
You have a new MAC address now. Maybe you have to fix some router settings to speed up data transfer.
Can I change the size of tmpfs?
I don't know. I did it for my Ubuntu Linux by editing /etc/fstab, but this doesn't works on LE.
2019-04-14 17:25:07.237 T:1742455664 WARNING: Process directory 'smb://USERNAME:[email protected]/SERIES/delete/' does not exist - skipping scan.
Maybe this would be a cause? I already c reated a swap file too ( if not enough memory) but this doesn't change anything either
No, it's Samba stuff. You can deactivate Samba at the LE services settings, if you don't use it. You can deactivate Wifi at the network settings, too, since you are using Ethernet.
If a swap file doesn't helps, it's maybe the size of tmpfs.
I saw something about wlan as well, so followed this guide to blacklist wifi. But didn't help:
Create the file /etc/modprobe.d/raspi3-blacklist.conf by adding the following entries:
#wifi
blacklist brcmfmac
blacklist brcmuti
The rpi runs over (POE) Ethernet
I'm using an RPi3B+ with Ethernet only, too. There is no need do deactivate Wifi by blacklist any driver.
Thank you, but this log doesn't tell what we need to know. It has no significant errors.
Activate log level 1 by creating the file "/storage/.kodi/userdata/advancedsettings.xml" with the content:
<advancedsettings>
<loglevel>1</loglevel>
</advancedsettings>Reboot, reproduce the error situation and post "/storage/.kodi/temp/kodi.log".
Unfortunately the output doesn't represent the error situation. Activate logging and try to reproduce the error. At the log file we can see whether it's about SD (tmpfs) or RAM space.
This was not your question, but I would think about creating a swap partition, when it's just about RAM size.
This means, you need significantly more processing speed, compared to an RPi 3B+. You should go for a fanless HTPC. There are nice aluminium cases out there.
PS: This thing runs Ubuntu, so all drivers should be there to run LE, too: Cirrus 7 Nimbus
PS: Look at line 2 of this post to learn how to play something from a script.
OK, that's doable, too. Write a Python script, which permanently scans the existing files of your folder, and plays them. You can autostart that script after RPi boot by using "/storage/.config/autostart.sh".
If you have a static content in your folder, you can use an autostart script to play the playlist for that folder.
If you have dynamic content in your folder, it's more difficult. Then you have to deal with playlist updates, and how to deal with already playing files. My suggestion for dynamic content is to upload a new playlist together with every new video file.
You mean as Android version..Right?
Yep, the Kodi Android app. Android has all the API's to do all media handling with excellent performance. There is really no need to build an own OS for the Shield.
so LE not supported until now!?
To my knowledge, it's not. There is no reason, because LE is a Kodi port, and Kodi already runs fine on the Shield.
