1 device has throttled download speeds but not upload

Aug 4, 2018
1
0
10
I have gigabit fiber optic internet. I have multiple devices connected out of my router. We have an out running from the router into a gigabit switch which then sends a connection up to our computer room.We have the computer room line running into another gigabit switch which then feeds 1 line to my girlfriend's PC and 1 line into my PC. We have tried switching who is plugged into which port, plugging only 1 in at a time, etc and have seen consistent results. Those results being: My download speed is consistently at about 4-450 Mbps, her's is around 7-50 Mbps. Our upload speeds are always both around 850-900 Mbps. This leads me to believe that something on my PC is throttling my download speeds. However I have no idea what it could be. I run Avast & MalwareBytes to an OCD-level.

My only possible idea is I may have registry issues. I ran CCleaner's Registry Cleaner tool a little over a year ago and have been having weird stability issues since then. I'm not sure if any of those registry files have anything to do with just my PC's ability to handle download speeds but that's my only idea.

I've made sure all of my drivers are up to date. We've swapped switches, cables, ports on switches, everything. I'm 99% sure it's something on my PC but out of ideas.

Any help is greatly appreciated!
 
Solution
You could try a very old line mode program called IPERF. You would transfer data between the 2 pc you have. Since only 1 switch is involved it would isolate the hardware. The program is extremely small so it is not affected by memory or cpu loads.

Now a complete guess but does your pc have a killer nic chipset. People have been reporting lots of strange issues. Seems microsofts latest large patch broke the killer drivers again.
You could try a very old line mode program called IPERF. You would transfer data between the 2 pc you have. Since only 1 switch is involved it would isolate the hardware. The program is extremely small so it is not affected by memory or cpu loads.

Now a complete guess but does your pc have a killer nic chipset. People have been reporting lots of strange issues. Seems microsofts latest large patch broke the killer drivers again.
 
Solution