Channel change time should be the same as with Android software. I suspect TVheadend isn't set up correctly for the tuner in KI PRO (the delay being it looking for a none existent tuner). Try going through setup (step 2) again.

For more detailed help there is a great thread on LibreELEC forum devoted to KI PRO: https://forum.libreelec.tv/thread/2722-8-0-2c-libreelec-8-0-builds-for-ki-plus-kii-pro-ki-pro/?pageNo=1

Hello,

I found the solution - the reason for slow zapping was slow SD card. I replaced them for faster one (Class 10) and now is DVB-T zapping speed OK.

I alsso tried DVB-S with scrambled channels. I found there is the CA setttings (Newcamd protocol) in the Tvheadend, so I changed the settings regarding to my testing Oscam server, but does not seems to be working. Did you try CA in Tvheadend? Does it work?

Thank you,
Tomas