Hi to all,
When I started this post I thought that I was the only one with this problem and that I did something wrong with the setting, but it turns out that almost everyone is having or being annoyed with the same issue as me. I know that "annoyed" is a strong word for something that is free of charge, but due to a lack of paid version of this software we, as end users, have to express our satisfactions as best as we can just to let the creators of this wonderful peace of software where the bugs are hiding.
One of the solutions, by my opinion, is to downgrade to xbmc 13.2 where changing the channels is between 1 and 5 seconds (depending on the resolution of the channel and buffer). I did it on my PC and life started to get better
but on the other hand my Raspberry Pi 2 is still waiting for a solution, because I (at the moment) can't find any lower version of openelec than 4.something compatible with Pi2 and those are the versions that have 10 seconds + buffering between channels.
@ Kodi-Team Keep up the good work and please post if you find any solution.
P.S. I'm not an expert in writing or reading software code and that's why I won't go any deeper on this subject, but I'm looking forward to a newer version where those 10 seconds will be reduced as much as possible.