Horridly slow internet on only one computer

InOuter_

Honorable
Feb 26, 2016
8
0
10,510
Over the past month and a half (could be longer, but this is when it started bothering me), the internet connection on my desktop has been so slow as to be barely functioning. There are eight computers in the household using our wifi, and I ran the speed test on a few. The Mac closest to the router, 80.2 Mbps download. The PC closest to the router, 63.3 Mbps. My Macbook (the one I'm on now), 9.8 Mbps.

My PC, a Dell Optiplex 980DT: 0.4 Mbps

Hardware info: My network adapter is TP-LINK TL-WN725N. Our wi-fi router is Verizon mo. MI424WR (though our network was bought out by Frontier). My OS is Windows 7 64-bit.

What I've tried so far: Network diagnostics, which didn't find anything. Resetting the adapter and router, still no luck. I saw other threads regarding an AMD Quick Stream issue. My previous graphics card was AMD, so I thoroughly searched the computer. No AMD files, no Quick Stream anywhere, so I've ruled that out.

Could this be a hardware (maybe the adapter) or software issue? My current graphics card is Nvidia, so I wondered if they had something similar to that AMD program. I will continue to try all I can. Any possible solutions would be greatly appreciated.
 
Solution
I don't think that 1 interfering channel would cause that much degradation. Not to mention, other devices are still getting good speeds.

Try reinstalling the drivers for your wireless adapter as it might be the problem. I wanted you to do a speed test with wired just in case your NIC was the culprit. Regardless, keep me posted.

TheKingHK

Honorable
May 5, 2012
65
0
10,660
Is your desktop the furthest from the router? Or is it behind thick walls / near any other types of interference? This might just be a result of weak signal.

Quick way to test it would be to use wired Ethernet and do another speed test.

If that's not possible, use a WiFi analyzer to check if there are too many interfering signals. If that's the case, change your WiFi's channel to either 1,6, or 11.

Keep me posted.
 

InOuter_

Honorable
Feb 26, 2016
8
0
10,510


Oddly enough, there are two computers farther away from the router than mine that seem to get good wifi.

I was able to use a wifi analyzer to check the channel... there was another wifi network on the same channel with a stronger signal than ours (I assumed it was the neighbors). So I changed the channel from 11 to 1.

Until I noticed the other network also changed its channel to 1!! I was about to panic until I realized that it's the freaking smart TV in our living room that's the thing giving off the stronger wifi signal on the same channel. I gonna hope I have permission to disable it...
 

TheKingHK

Honorable
May 5, 2012
65
0
10,660
I don't think that 1 interfering channel would cause that much degradation. Not to mention, other devices are still getting good speeds.

Try reinstalling the drivers for your wireless adapter as it might be the problem. I wanted you to do a speed test with wired just in case your NIC was the culprit. Regardless, keep me posted.
 
Solution