Faster zapping

#1
Hi!
I tried ProgTV on 4 different Android TV boxes, 2 from well known brands (Minix and Zidoo) and 2 from "white brands".
I have fast and stable internet speed, and strangely enough the zapping on the cheaper boxes is must faster than on the brand boxes, in these ones it takes about 4 or 5 seconds to change the channel, while in the cheaper ones the zapping is immediate (I don't think it has anything to do with it, but Minix and Zidoo have 2GB/16GB of memory, and the others 1GB/8GB).
Is there any specific reason for this? Now I'm using the Zidoo for everyday use, and I would like to have a faster zapping, can I do anything about it?
Thanks.