No way to disable XBMC buffering

Why my PC on the same LAN not buffering, but rasberry - buffering..
It takes so long before every TV channel.
I using TVheadent via Videos - Files - Shortchut to my server.
Nothing helping... I have tested on Openelec, RaspBMC, Xbian... all do the same - buffering..

I have tested :

<network>
<cachemembuffersize>1024</cachemembuffersize>
</network>

unfortunately buffering anyway takes default time

then i tested this setting:
<advancedsettings>
<pvr>
<minvideocachelevel>10</minvideocachelevel>
<minaudiocachelevel>10</minaudiocachelevel>
</pvr>
</advancedsettings>

it is not helping too...


Buffering is reason why my wife want to chuck out my raspberry / xbmc tv project
I can not use Live TV because is buggy and crashing so often.