shippy
well you right , in small window the video are playing with mpv smoothly but even in small window you can't even touch the cpu heatsink and htop show cores very busy and the rest of functionality of the board very slowed
at the actual state I think is a little bit such as compare pears and apples because here on LE we have a finished work focused on media , on armbian media related stuff is work in process (still hacking all the video part) but indeed you can use armbian with great satisfaction as media server , voip server ( asterisk) samba shares, print server, mail and others and having a well reacting X11 environment too!
But even the thing could be in some way related to libreelec I still think this isn't the appropriate place and time to discuss of this, since the work on armbian is unfinished and not yet the right moment to have comparisons.
btw if you want have a try, thanks to great job made by jock2 here it goes some interesting links
Armbian 19.11.5 Ubuntu Bionic Desktop 18.04 - kernel 4.4.189
Armbian 19.11.5 Debian Buster Server Minimal - kernel 4.4.189
but be ready with ,e.g, not even boot caused by incorrect/unadapted ram speed , wrong loader blob etc etc etc:
I am sure you have your uart always connected to easily debug problems.
For me, I will not answer more on armbian related stuff on this libreelec forum at the moment, thank you