i hv q16 quad on 1.0.6 and q5ii dual on 1.0.8.

spmc is a fork of xbmc. i tried it on q5ii, it works but i found it unstable, crashing. so i reverted to xbmc 13.2 and now kodi 14.0 beta2.
xbmc 13.1, 13.2, kodi 14.0 beta2 are all stable on q5ii.

q16, xbmc 13.1 and 13.2 are not very stable, crashing. kodi 14.0 beta2 is stable for q16. kodi (but not xbmc) can take new addon bbts 1000 live tv channels. tested it quite a bit, it is a great addon to have, the best live tv addon there is - usa, uk, italian, french stations... plus concerts, news, documentaries, history channel, travel channel, food network, etc., etc.

i do not know if the differences in performance of xbmc, spmc and kodi are due to brand, model, dual/quad or firmware or something else but i would think q5iii quad should be the same as q16 quad for kodi as the specs r the same except for emmc size.

i do not know if spmc addons/settings will migrate to kodi like it does with xbmc when u install kodi (a folder named org.xbmc.xbmc will migrate and get renamed org.xbmc.kodi). kodi now seems to be giving cold shoulders and understandably so, to ex-xbmc spinoffs like xunity.
that is actually good so that u dun need to set up all over again; just remove xbmc (or spmc?) app when satisfied with kodi.

yr concern is about playback via xbmc lagging... this i can't comment as i dun do local hdd playback on xbmc (understand u do that for extras like logos, get subs) i always use native player which works very well incl iso/bdmv/dtshdma. for q16 native local playback, pressing menu button on remote gives a photoshop quality setup option where u can define yr own picture quality parameters.

the native player is excellent. handles everything nicely, incl iso n bdmv playlists, chapter lists correctly.

i hv tried mx player, XBMC player and a couple, more....none are as good.

r u nicety's customer?
if u bought from other seller, best to get the seller's help.
xbmc or kodi can be a real b**** if u dun know how.

anyway, for bbts livetv, i suggest u read and watch the suggested videos mentioned in posts #910-939 xbmc-kodi thread at least.
u can tell from the posts some users struggled with it but got it in the end.
https://forum.lowyat.net/topic/3139601/+900

i assure u q5ii or q16 (and by inference, q5iii) can take kodi 14.0 helix beta2 or beta3, have bbts live tv working.
looking forward to epl live matches this sat on skysports 1 and 5.

About the MangoTV, if you bought from me, pls PM me your MAC address and your email address. If you bought other seller then you need to talk to your seller.

What is the model you bough bro?