Youtube slows down my wifi down to zero (windows 10)

[Mjine]

I'm really baffled by this problem. When I'm using my home wifi with my new laptop and watching youtube, the internet speed basically halts, and the youtube video just buffers, maybe continuing after a while with 144p. Weird thing is that otherwise the internet seems to be fine, even if speedtests show me at around 0,2 mbs. Otherwise my speed is around 10-20mbs. My wifi works fine consistently on other devices (PS3, PS4, tablet and a phone plus other PC's, all using youtube without problem) I have tried shutting them all off, but the problem persists. Then if I use an inferior wifi hotspot sent from my phone, then youtube works without problems on my new laptop. (hotspot speed is 5mbs.) It also seems, that my ping jumps up during these times, so I'm not sure if it's actually my connection or if it creates latency like no other (spikes around 500-1500ms) I'm at a loss here, so I thought of asking you folks. I hope you can provide assistance, that would be much appreciated.

My laptop is Asus X550v, Windows 10 home 64 bit Intel i7-6700hq 2.60ghz, 8GB ram, Nvidia geforce gtx 950m, and Inter HD graphics 530 256 SSD. Motherboard seems to be Asustek x550vx or something. I am using 802.11n but have tried 802.11b & 802.11g but those create a variety of other problems. I have tried also updating my router via autoupdate and getting an update from motherboard-manufacturers website. My router is zyxel VMG1312-B10D, and my internet provider is Sonera (one of the biggest ones in Finland). My wifi device is Realtek 8821AE Wireless LAN 802.11ac.

I tried Chrome and firefox, I tried updating plugins (flash mainly). I tried forgetting the network and then using it again. I have disabled location and bluetooth. I have also removed extensions from chrome, and it did nothing. I also tried restarting the router many times, to no avail. The problem is not occurring all the time, but usually comes in a few minutes after watching youtube. I tried disabling QoS from my router, but It did not seem to help. I also did a clean boot, and problem remains.

I did a test when internet was semi-working, and then another one when it got slow again.

1st: http://www.speedtest.net/result/5787005356.png
2nd: http://www.speedtest.net/result/5787015538.png
Here is also what my youtube stats looklike when it happens. https://dl.dropboxusercontent.com/u/14256970/Youtube%20...

Also interesting to note, when ever I do the speedtest, the youtube speed returns, but starts decreasing when the speedtest is over.

Thanks for all the help already, and please ask if I didn't mention all the relevant information.

 

[DelJo63]

Launch TASKMGR->Processes & click Show ALL (you'll need the admin pwd)
click on the CPU column label until it shows a down-arrow

access youtube

put taskmgr as the active window

when YT is acting badly, get a screen shot of the taskmgr and post it

 

[Mjine]

https://dl.dropboxusercontent.com/u/14256970/Taskmngr info.png

Hopefully I did it right, and if not, I'll try again (I didn't find a "show all" but an "expand all"). Hope that gives some insight.

 

[ATLVM]

Launch TASKMGR->Processes & click Show ALL (you'll need the admin pwd)
click on the CPU column label until it shows a down-arrow

access youtube

put taskmgr as the active window

when YT is acting badly, get a screen shot of the taskmgr and post it

Youtube isn't an app.. it will not show up. Its a browser session...

 

[ATLVM]

https://dl.dropboxusercontent.com/u/14256970/Taskmngr info.png

Hopefully I did it right, and if not, I'll try again (I didn't find a "show all" but an "expand all"). Hope that gives some insight.

You have a bandwidth problem not a CPU problem as evidenced by the task manager report, you only have 4% CPU utilization.

I think you have some add-in or worse.. you have a malware that is triggered by youtube.. since you said it dies when you start speedtest that means it has priority, therefore something is forcing the browser running youtube to take ALL bandwidth... this might be harder to identify.

 

[ATLVM]

https://dl.dropboxusercontent.com/u/14256970/Taskmngr info.png

Hopefully I did it right, and if not, I'll try again (I didn't find a "show all" but an "expand all"). Hope that gives some insight.

Some suggestions:

1) get rid of Avast it sucks. There is *NO* substitute for a GOOD Antivirus (Bitdefender, Norton, Trend micro). You need to BUY a good solution. You want the problem to go away, start here.. its 50 bucks max.. maybe less. GOOD investment trust me. I know people will say Avast is good if that's true then WHY do you have problems? Something isn't right.

2) what is web helper? It's on the task manager list.. at least twice. I don't like generic names especially when they have "web" in the name, need to track that down and remove it.

3) get malwarebytes. https://www.malwarebytes.com/ Antivirus is only good if its running PRIOR to bad stuff happening this is where malwarebytes comes in, you need to download it and let it run to find ALL bad stuff.. then remove whatever malwarebytes tells you.

4) turn QoS back ON the router, never turn that off.. it's there for a reason and it works..

I think the problems you have are related to add-ins and software on your machine.

TL;DR replace antivirus with something better scan your machine for malware / spyware (I believe that is the culprit) use QoS on router.

 

[DelJo63]

Youtube isn't an app.. it will not show up. Its a browser session...

Yes, that's perfectly clear. I am looking for other activities, in the system level