Howdy all, an important change that I certainly overlooked is that the settings for readahead/cache which we previously implemented via the advancedsettings.xml file within the userdata folder have now been replaced by a GUI option under Settings > Services > Cache.
I wondered why I was having playback buffering issues since updating to LE12 on my Starlink connection until I noticed the system was not reading ahead.
These new GUI options override whatever you have in the advancedsettings.xml file.
This is documented on the Kodi site and I am sure its in the release notes somewhere!
Hopefully this saves some of you some pain!