looking for iptv player with built in editor

hi like the title says - is there such a thing

the closest i found was lazy iptv where i can add to favorites but also (which is different from other apps) create groups of favorites and not everything in the same group

the problem is it doesnt handle big playlists so good -its slow to load the list

i found an online editor - xtream-editor - but if i edit there how can i export it to use in smarters or xciptv app ? they dont accept m3u file

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so is there such an app ? how do u edit a playlist with over 10000 entries for example?