Ladies.. Enough with the pissing contest..   True 4K/UHD boasts a 4,096 x 2160 res screen and not 3,840 x 2160. So if your TV/Monitor doesn't...    ..Know what's even worse? Content being watered down or up-scaled to 3,840 x 2160 with low bitrate...

I'm gonna go enjoy my 1080p screen.. 

i already said i hv cheap router, no 5ghz.

That's a reason choosing smaller vid size. think about it because even you have 200mb broadband line doesn't means you intranet streaming with wifi will be far much better. LOL

I have tested 40GBs to 60GBs 4k vids over network to my himedia q10 pro, macam lagging. I'm using Giga LAN and over TPLINK AV1200 powerline.

At last bought 4TB external usb3 disc to put all 4k movies inside and connect via usb3 to q10pro. Now I got more than 50 titles (almost 3TB) 4k movies .

Surprisingly 4k movies (dolby vision) on netflix over 30mbps unifi, no lag at all. But cannot use q10pro as it's not authorize netflix player.

So did you find out where is the bottleneck? It should not lag with GB Lan and that powerline benchmark at 160 mbps.

Netflix 4K is around 16-18 mbps...they recommend 25 mbps line only...

I thiink its the poweline bottlenecking the connection as my router and pc its upstairs and himedia is downstairs. How much exactly the powerline max real world transmission is vary from case to case and dependable the distance of the power line of a house and how much noise in it. But definately 30mbps unifi is not an issue as i can easily use speedtest.net to check. But for file transfer max speed over the powerline i have yet to test. Maybe later will do it and share the result.

At last bought 4TB external usb3 disc to put all 4k movies inside and connect via usb3 to q10pro. Now I got more than 50 titles (almost 3TB) 4k movies .

I'm gonna go enjoy my 1080p screen.. 

That's a reason choosing smaller vid size. think about it because even you have 200mb broadband line doesn't means you intranet streaming with wifi will be far much better. LOL

I have tested 40GBs to 60GBs 4k vids over network to my himedia q10 pro, macam lagging. I'm using Giga LAN and over TPLINK AV1200 powerline.

At last bought 4TB external usb3 disc to put all 4k movies inside and connect via usb3 to q10pro. Now I got more than 50 titles (almost 3TB) 4k movies .

Surprisingly 4k movies (dolby vision) on netflix over 30mbps unifi, no lag at all. But cannot use q10pro as it's not authorize netflix player.

this ^
a lot of 4k content still look awful 

i am quite sure u do not know what is meant by that bolded sentence.
that sentence refers to playback with KODI player, as in the app KODI.
that, is the heartache of many boxes using kodi - pls read kodi thread.
becos many people like to playback their hdd collections with KODI player - for kodi's artwork.
some like playback with other players like MX or VLC.
take note some boxes do not come with native player, i.e. a player where u play direct clean and simple, no need another app player.
himedia used to be a pure media player co., every box they make comes with their own himedia player.
Q5/Q10 pro native player is a powerful one, with imprex engine2, can do extras like HDR, dolby vision, DTSX, online subtitle download, picture quality parameters adjustment/tuning - not found in most other players.

so, that sentence refers to playback with kodi app as it is. the last bit about wrapper means if u insist on playing back with kodi player, himedia's solution is to use the wrapper, an app which "wraps" the stream from kodi, bypass it and play thru the native player. this wrapper, for now, works fine if u playback with kodi but does not work with regular kodi online streaming, something that needs to be fixed by a new firmware, not done yet.

i do not like local playback with kodi, prefer playback direct with native player. have used q10pro for 3 months now, have hv not seen a single file in my collection that does not play correctly.

i do not know what files u have in yr collection, but i have banyak terabytes ... all sorts... incl 50, 66gb, 4k, hevc, 10bit, mkv, m2ts, iso, whatever...
afaik, the native player in q5pro is the same with q10pro.

there are 2 diff between the two - q5pro is 2/8gb while q10pro is 2/16gb;
q10pro has a compartment to slot in an internal HDD while q5pro does not.
as far as USB playback with ext HDD is concerned, there should be no diff at all.

if u decide to buy one of these, i suggest to confirm with seller about the latest firmwares.
the current q10pro firmware is 2.0.1 (there is a very new 2.0.3 which i hv not tested yet).
q5pro, i don't know.

Thanks. Yup...bottleneck can be from many things, including use of lightning /surge protectors, 3 phase wiring, grounding, cat cables, protocol setup, etc.

I had some spare routers, so connected a pair as repeater (one as access point, one as client bridge to my main router) thinking this way I can eliminate the half-speed effects...turns out the Lan connecting both was a bottleneck worse than the half-speed effects... lol...

usb... u did not want an internal HDD to slot inside the compartment?

I think both read speed over usb 3.0 and sata 3 is about the same. Not much different.

I chose external disk because it's easy for me to unplug and connect it to my PC for huge 4k file transfer.

I tested q10pro and put an internal 2.0TB 3.5inch hdd and use samba network transfer from my PC, the speed is unacceptable. 2-5mbps, ridiculously slow, 1 movie 30GB about 6-7hours to transfer. If usb3 transfer i got about 70-80mbps, if sata3 transfer I get about same as usb3, which is about few minutes.

Direct CAT6e Ethernet everything connection.... With great broadband speeds comes greater hardware requirements.. 
Direct CAT6e Ethernet everything connection.. Better router & NAS.. Another one of the reasons, I have jumped on the bandwagon just yet.. I'm all about efficiency.. Seamlessly enjoying 4K content ain't cheap.. Must upgrade everything and lay cables all round.. Powerlines are a no go in my books where high stable networking are required.

It's not unsurprising that you are able to stream "4K" via Netflix. Netflix is not pushing out true 4K. Just better enough pq than true 1440p. The rest is the result of your TV's up-scaling engine.. 
  In all fairness, it's just some that are awful. The majority AFAIK actually look superb, especially with HDR... However, not in sufficient quantities to convince me to replace a fully functioning quality display. *knocks on wood*... Besides, TV tech will only get better and cheaper, so there's the plus side to waiting.

I think both read speed over usb 3.0 and sata 3 is about the same. Not much different.

I chose external disk because it's easy for me to unplug and connect it to my PC for huge 4k file transfer.

I tested q10pro and put an internal 2.0TB 3.5inch hdd and use samba network transfer from my PC, the speed is unacceptable. 2-5mbps, ridiculously slow, 1 movie 30GB about 6-7hours to transfer. If usb3 transfer i got about 70-80mbps, if sata3 transfer I get about same as usb3, which is about few minutes.

Direct CAT6e Ethernet everything connection.... With great broadband speeds comes greater hardware requirements.. 

thanks for all the details shared! i also same same like you, all MKV REMUX files, but no 4K yet ... just probably full hd contents. right, will check on the firmware. i plan to get from lazada, any shops that you can recommend?

if that hdd fails, u will crying!

i had that once, never again.

if hdd kong, download again lol 

a few GB, ok.

a few TB, will take a month!