about kodi m3u lists...
what kodi version r u on?
yes, if the list is very long, it will take a long time to load, sometimes will hang.
not only with kodi but any player doing m3u lists.
if u hv good experience with vlc, u can install vlc app and try it.
about himedia q10pro...
better u post and ask in himedia thread:
https://forum.lowyat.net/topic/1849024/+3360
describe more so that others can understand:
.. where u bought it?
.. can u get help from seller?
.. what firmware version?
.. what apps preinstalled?
.. how much u know about android boxes?

Over 30k privately hosted titles. Each possibly with multiple links for redundancy... There is such a thing as too much.. Server issue.. Not Kodi.. Guess the premium isn't actually premium. Yours is a prime example of why I comment that subbing to all those "we have crazy thousands of IPTV+VOD" does not work out favorably. If the providers servers and bandwidth aren't capable (most cases they aren't) enough to handle the load, ultimately users will suffer too from long initial loading times and buffering. You didn't make mention of the service having updated EPG. Bruh, you haven't waited long yet.. ..Their devs are typically a handful and cannot cope with the load. Expect that service to either downsize significantly or die soon, not easy being YouTube. Ask IFlix..