One of the main features of the Killer Network manager is that it enables you to prioritize different programs and tweak the bandwidth available to programs on the aurora, so your suspicions are probably correct. When someone is using the Aurora for an online game, it's probably prioritizing that game over everything else in your house. Have you tried looking around in the Killer Network Manager? (Should be a bold K in your system tray). IDK if you can allocate bandwidth to other devices, but you should be able to throttle Roblox a bit at least.

That's great, thanks for your answer.  I'll have a go and see if I can reduce the bandwidth capability via the KNM.  

One question though, any idea how a device can actively reduce the speed of another?  I'm struggling to understand (wouldn't take much!) how the Killer Network Manager could physically reduce the speed of another device (e.g. PS4) without being able to control it (or actively control the wireless modem etc.)?  Any ideas?

This is probably a horrible explanation, but maybe a decent comparison would be that internet bandwidth from your cable company is sort of like water pressure. If you've got a ton of bandwidth and there's no bottlenecks like a slow wireless router, then everything works perfect. And most wireless drivers distribute bandwidth evenly. But unless you give it other orders, the Killer Wireless card is turning the shower on full blast every time someone uses the Aurora for an online game, so there's less bandwidth/water pressure for the PS4 and everything else. It probably has Roblox set to "Priority 1." Go to Applications, find that, use the drop down menu to set it to a lower priority, and then use the sliders to lower/cap the download and upload speeds. May require some tweaking, but once its set right, you should be able to do both with no problems.

Really appreciate your great analogy! I guess the answer is in the name....'Killer'...

I'll give that  go as soon as I can this week, really appreciate your efforts and assistance.  Hopefully I can go back to getting my *** kicked in battlefield sometime very soon.....  Although I wont be able to use the lag as an excuse any more....  Thanks again...

Over the years, a few users have reported similar. I've always thought it was impossible for a "client machine" to affect the router but as more instances are reported ... really makes me wonder.
 
It might only happen with certain routers.
 
My guess is the Killer cards are monopolizing the router's resources or similar.
 
You could try the Router's QoS ... or a limiting setting in the Killer driver-suite.
 
An alternative work-around might be to set the Aurora-R5's Killer card to WiFi-G protocol only. That should slow it down. If this was Ethernet wired, you could try limiting to 100mbs (turn off 1000mbs).

Much appreciated advise.  I'll give that a go in conjunction with the settings suggestion above from matt.  On the face of it sounds idiot proof, but then again this is me...  Im away from home for a couple of days, but will tackle when I get back.  It's a very good thought about the router.

I have a three year old Telstra (Aussie telecoms provider) own brand standard ADSL 2+ router.  I have been thinking about upgrading since I ordered the new PC and have looked in to a few options, but all seem 'all singing all dancing' when the reality is I just need one that maximises the wireless signal/bandwidth and 'has' to be easy to swap over/install.  Don't want any programmable issues arising and/or a zillion options upon install, just simplicity, quality and reliability..  I realise I'm being a little pathetic, but I have learnt the hard way in the past (I even had to google 'QoS' if I'm honest) ..  I know my limitations!

If anyone knows about a good ADSL 2+ modem out there that would suite my needs in the Aussie market that would be excellent.

Here's another question (maybe I should put on new thread?).  

Is Steam the only decent games site for downloads?  I have looked on a few sites / review threads but nothing really conclusive, appears that Steam is the one.  Steam really irritated me on a laptop in the past when I bought Civ IV. Planned for weeks to have Civ weekend, I put in the disk and then forced me to get a steam account which crashed several times and took forever to download (although was a few years ago)... weekend gone.  I have to admit I was shocked when I got the Aurora out of the box and had no optical drive...  I had no idea!  I know I'm the numpty..  I assume that even if I buy an optical drive (appreciate they are cheap), if I get a game on disc nowadays, it will need to be downloaded anyway....

I'm old skool, I liked it when life was simple... You bought a disc, installed it and in 20 or 30mins (at worst)you were playing...  

Even better, bring back the Amiga 512k!  I used to have a spectrum 48k, how I loved that machine (and it's separate tape deck)... I'm feeling a little old about now...

Thanks again Tesla...

Hi again, Joemar. I just checked around, and here's an article that might help make sense of it: www.pcgamer.com/.../    (although, as some of the commenters complain, when the article isn't explaining the basics, it's sort of pitching gaming routers. I'm not suggesting that as a solution to your buying a new router. And you can use the Killer Network Manager that you already have to test the speeds you're getting from your ISP. A new router won't help much without sufficient bandwidth coming in from your internet provider).

Anyway, the article explains the QoS that Tesla mentioned, as well as the Killer Network Manager just below that. Tesla probably knows more about this stuff than me, but since you seem to be having trouble with one main scenario (your daughter using the Aurora for Roblox seems to be slowing the PS4 connection significantly), I'd still try using the Killer Network Manager first to cap the bandwidth used by Roblox and see if that solves your problem. Easiest solution, since KNM should already be installed. If that doesn't work, I'd return Roblox the the default settings in KNM, and then try and see what you can do with the QoS.

Regarding Steam, you're right. Other than a few companies like Blizzard, they're the main place to get PC games, and as you've already discovered, a lot of publishers use them for DRM and updating, so even if you buy an external optical drive and purchase games on discs, there's a good chance you'll still need an account. The good thing is, they have lots of sales (on new stuff as well as older titles that get really inexpensive).

Thanks it's good to know there are other reputable sites, bar Steam. I am not brave enough to go 'unofficial' with downloading games...  It will be good to see if Steam still has my CIV, that would be fantastic....

An Amiga with 3 megs, the stuff dreams are made of (at least back in 1988!)...  My only ever gripe with the Amiga was it came with an official game called 'Interceptor' (from memory).  The first level was taking off from an aircraft carrier and you had to land it to move on in the game.  I can honestly say after several hundred hours I couldn't land that *** plane properly.  Never met anyone who could.  Makes me wonder whether the game had any more levels ;-)

Thanks Tesla for all your advice.  Really appreciate people like yourself and matt taking time out to help the IT illiterate.  Truly appreciated...

1. Is Steam the only decent games site for downloads?     2. it will need to be downloaded anyway....   3. Even better, bring back the Amiga 512k!

1. I have Steam, Origin, UPlay, and Battle.net. Steam is my favorite. Check out the Steam sales and also  Humble-Bundle for some deals.
 
2. If you already added Civ-IV to Steam, just install Steam client to new machine. All your games will download with no disks.
 
3.Finally sold my Amiga 500 (with HDD and 3megs) a few years ago. Hated to see it go. Now, I just boot the Amiga Emulator from time-to-time:

Cheers Matt, really appreciate the link and more info. I'll go through in detail after work.  I'll take your advice and try to cap the bandwidth and hopefully hey presto..  KNM is already installed so should be ok.

I'm probably being a little unfair to Steam, it was a few years ago and really ruined my planned CIV weekend - free weekends few and far between these days..!  I'll have a real look through this weekend.

Great advice !  As soon as I get back later in the week, I'll give it a go and update the thread to see if it can help another IT numpty like me...  Thanks again...

Win10 can be speeded up by turing off all the background apps and all the live tiles on the start menu and killing cortana.   Then you remove IP6,  Teredo, and ISATAP.  Lastly you turn off Update strangers on the internet or local Lan with windows updates.

Most of Blizzard's games are free to try.  Just download the Battlenet app

http://us.battle.net/en/app

The desktop app for Battle.net is designed to improve your launcher experience. It'll also streamline your ability to play Blizzard games!

. 

Thanks SpeedStep.  Can you please advise what impact removing the apps has (i.e. IP6,  Teredo, and ISATAP)?  Does it affect any other programs etc.?

I'll certainly  download the Battlenet app (thanks).