Connection Severely Limited - Randomly Started few weeks ago

[isherwood_712]

Some information;
Connecting Via Wireless USB Adapter; Realtek RTL8192CU Wireless LAN 802.11n USB 2.0
Trying to connect from my desktop computer, on a shared router with SKY as an ISP provider
Did not start until a few weeks ago, everything worked fine prior to this.
Frequent speedtests of 0.40 mbps on a fibre optic broadband connection shared by only 2 people

Tests I have done already
1. Did a speedtest on my girlfriends laptop which gave her a result of 11mbps, as her connection worked fine I ruled out that it could be ISP related, my phone runs fine on wifi fine also
2. Tried to connect to the internet on her laptop by disabling her network card and using my Wireless adapter instead, did a speed test which gave a result of 17 mbps which was infact quicker than her previous method. Judging by this I ruled out that it was likely not the adapter which was the issue.
3. Uninstalled my wireless adapter in device manager and reconnected it, no change.
4. Ran my computer in safe mode with networking and tried to test my speeds again, still had incredibly slow browser loading and 0.3-0.6 speeds on speedtest.
5. Tried with my firewall turned off, same speeds.
6. Ran some anti malware scans, which came up empty, dont think my issues is virus related
7. Tried a completely different wireless adapter which I also saw incredibly slow speeds with, leading me to assume the issue I have is computer side.
8. Tried using different USB ports, all providing the same results/speeds.

I'm no computer expert and a lot of my tests were suggested to me by a more knowledgeable friend who seems to be baffled by my issue also. Essentially my computer is so slow at the moment that I have to wait seconds just to watch my browser load up. What I found strange was when I tried to do a ping test in command prompt I was actually coming up with decent pings then either random spikes or disconnects;

https://imgur.com/a/8gJdODR

I had planned to do some gaming this weekend and had hoped I could resolve this in time but I appear to have underestimated my issue, if anyone could help me resolve this in time I would be really grateful. Thanks a bunch in advance.

Edit: To add to this my upload speeds appear to be working fine, its just my download which isnt;

https://puu.sh/AfBkr/39df2dfd66.png

 

[camieabz]

If it's at all possible, try connecting via wired ethernet, rather than wireless to see if things any different.

Compare your network settings (Default Gateway, DNS Servers), and if possible change yours to match the ones of your GF's laptop, assuming we're talking from the same location. Sit the desktop as near to the router as possible (might not be feasible). Test the GF's laptop from the desktop's location, swapping the adapters about from the desktop's location. It might be a distance / line of sight thing (it happens). Also consider anything near the desktop or between it and the router that might cause interference. I had one that required the user sit in one area, but not another, as there was a lot of electrics in the wall. A different adaptor worked well regardless of the location.

https://support.zen.co.uk/kb/Knowledgebase/Broadband-What-affects-your-WiFi-signal

Run the following pings:

ping 127.0.0.1
ping "default gateway IP"
ping "Primary DNS IP"
ping "Secondary DNS IP"

The first should be instantaneous, and should look like:

Pinging 127.0.0.1 with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

You should get a similar response from the default gateway, and you should get a fairly quick response from the DNS servers (I get responses in the low 20s). If you get anything slow in these tests, let us know. If not, you might need to look at what's running on your system, and whether it's hogging your network bandwidth (e.g. automated updates, too many programs), or even hogging your system resources, and slowing your local networking as a result. Slow computers can affect network performance.

(I don't suspect the DNS servers themselves, since the ones your GF was connecting to seemed fine, so rather, I'm suspecting how your system connects to them.)

Perhaps setup a bandwidth monitor at the client end, and see what, if any network activity is going on. Wireshark is a handy tool for seeing protocol and interface activity. Have a watch - https://youtu.be/TkCSr30UojM

Lastly, try

http://www.tomshardware.co.uk/answers/id-3193528/realtek-8192-wireless-usb-adapter-problems-win.html
http://www.tomshardware.co.uk/answers/id-2195978/realtek-rtl8192cu-poor-performance.html

(Not sure what version of Windows you have - careful )