Vero 4K and DVBlink channel loading slow

Transcoding is disabled. I’ll will ask my ISP if it is possible to open my connection ports(right now all of them are closed).
My ISP offers open ports with static IP only. It costs almost 7 eur per month. Do you have VPN server that i could connect my OSMC?

OK, I have some findings!
Hardware accelaration h264 always enabled(default)
PVR & LiveTV playback Fallback framerate 50(same as Kodi refresh rate), if Fallback framerate is disabled i get still image on most channels(with hw acceleration enabled).
Screen refresh rate changing is enabled on start / stop
If TV Show is 50fps(problably 25 hw deinterlaced) it plays fine, if 59,94(again hw acceleration deint. is probably 2x fps) there is no sound, picture is choppy and every few seconds i get buffering.
When i either disable HW acceleration or set it HD and up, all channels work.
Picture quality(due SW deint.) is not as good as with HW accelerated deint.
Also strange thing is recording works both ways, SW and HW.
Hope there is more information from what to get the solution and make OSMC and Vero 4K better.