Windows 10: LAN Upload speed suddenly low

HelloMy LAN upload speed suddenly after Windows update dropped to 1 Mbps. The normal upload speed should be around 60 Mbps. The download speed is still normal about 600 Mbps. The wireless speed hasn't changed, it is still working well. This upload speed drop happened on one computer only. All other computers have full download/upload speed. Therefore, the network is working well. I also checked the cable, and the same cable on another computer works perfectly.I tried to fix the problem by following all suggestions in the thread LAN Upload speed suddenly extremly low - Microsoft Community.I

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Windows 10 on desktop slow Lan speed on upload

Hi, I am dealing with a really strange situation here. My desktop is a Window 10 Ultimate 64 system with 32Gb RAM. I recently upgraded my internet plan from 5 to 100Mbps. I firstly checked my laptop speed on speedtest.net on LAN and I got 96Mbps download
and 9,6Mbps upload which is almost perfect. I then plug the same ethernet cable to my desktop and the speed was 30Mbps download and 1Mbps upload. I assumed that it was the network card so I sent it for a check. They got 96Mbps download nad 9,6Mbps upload (in
their space with the same internet provider plan at 100Mbps), excactly as my laptop's speed. They add a new PCI network card and test it again. The same high speed. Great. Coming back at home, I connect everything and the speed was 40Mbps download and 1,3Mbps
upload, just a little better than before. Try the laptop speed again, 96 and 9,6 again, superb. I searched for hours the web and after many suggestions I managed to reach 89Mbps download which is almost what I need but the upload is stack at 1,5Mbps which
makes no sence. Any advice on that? My internet provider has no clue, neither the service team that changed the network card. Thanks.

 

Windows 10 Pro x64 - very low internet upload speed over Ethernet

Hi Tomas,

There are possible reasons why you have a low upload speed while download speed is high. For us to isolate the issue, please provide the following information:

• When does the issue start?
• Is your Windows 10 recently perform a Windows update?
• Did you download any third part driver that runs with your Network properties?

 

Windows 10 on desktop slow Lan speed on upload