Video playback problem

Hello.

I have Sattelite TV reciever with Hisilicon Hi3796MV100 proccessor 1GB RAM. It is on Android 4.4.2. Using KODI 16.1

I want to use KODI to play VIDEO from mine MEDIASERVER. I have a lot of blu-ray and .mkv files. I use NFS (also tried SMB) to play my files.
All goes fine with adding and sorting it out. But when I start to play VIDEO it is lagging. And the higher is bitrate the bigger lags I have. Problem is defenetly in my KODI configuration, and I’ll explain why I think so:

My set-top box have FILE BROWSER app with internal VIDEOPLAYER. And through that player it works great even on 35-45 mbit bitrate on my bluray movies. In KODI this movie is showing 1-2 frames in 3 seconds. Very laggy. With low bitrate on MKV file it lags ones in 5-7 seconds. I search for help in google and tried such cache setting:

<advancedsettings>
<network>
<buffermode> 1 </buffermode>
<readbufferfactor> 1.5 </readbufferfactor>
<cachemembuffersize> 104857600 </cachemembuffersize>
</network>
</advancedsettings>

It doesnt help at all.

Can anybody help me with my problem. Thank you.