Look at the specs of your Pi; Pretty sure it only has 10/100 lan adapter.
I'm sorry but I've specifically wrote that it's about a HTPC with an old AM2 Cpu/Mobo and a PCI Gigabit lan card.
Has nothing to do with a Pi.
I have been running Kodi in the past 6-7 years in a silent HTPC with an old AM2 Cpu/Mobo + a Geforce 8400GS card.
A few months ago I've bought a TP-LINK TG-3468 Gigabit PCI Lan card as I've watched more and more bluray remuxes around 25-30Gb size, and the default 100Mbit just felt too slow when skipping scenes. As soon as I placed the card in the mobo the added bandwith was immediately noticeable.
This was on a minimal ubuntu setup which I've installed years ago with a script from the official (xbmc) site.
Now I'm using Libreelec for various reasons but it seems that I only have 100Mbit network instead of 1000Mbit.
I don't have buffering issues or anything but when skipping scenes in those big 25-30 Gb videos it takes 6-8 sec to continue the playing.
Before using Libreelec I had maximum 1-2 sec of hiccups when scipping a scene.
I don't know if this is a SMB limitation in LE or just my card is recognised as 100Mbit but it would be nice to solve it.
Any Ideas how to do it ?