I tried Kodi addon simple IPTV. It did work, however, I had a few issues:

1. It loads the playlist every time I start Kodi, which is a considerable time as the playlist has over 25k entries (due to tags etc.). How to reduce this frequency to reload the playlist (I already have selected the option to persist the playlist locally).
2. The second issue is that the channels don't get sorted into group. It just displays a very long list containing all the possibly entries, which makes browsing very slow while changing the channels from the list.
3. Because, the channels were not being sorted, I manually sorted them into groups, but when I restarted Kodi, the channels playlist was reloaded and it deleted all the groups.

I liked the smoothness and experience that I had for the short time when I had my own small channels groups running. Is there a way to solve these issues?

Or is there a better alternative on android tv box that I can use?