Windows 10: Windows 10 internet upload speed only reaches 4 Mbit instead of 40 Mbit?

Hello,

for about one week I have a very mysterious problem on my Windows 10 PC.

The PC is connected by Gigabit LAN to a Switch and reaches full Gigabit speeds for up- and download inside my LAN for example when copying to or from my NAS.
The upload speed at speedtest.net in the new Edge Browser Version 86.0.622.63 reached around 1 week ago everytime the full 40 Mbit, but now only 4 Mbit.

I did not change anything and still reach full 1 Gbit speed inside my LAN.
The internet connection has constant 40 Mbit upload and varies only minimally. All other clients MacBook Air, iPhones, Apple TV are still reaching the full 40 Mbit, no matter if they are connected by LAN or WIFI.

I think that the problem came because of a Windows 10 update or driver problem and will affect more users.

The strange thing are the constant different speeds on the same PC in different browsers / apps:
- Edge: 4 Mbit Upload
- Firefox: 20 Mbit Upload
- Speedtes.net App / CLI for Windows: 20 Mbit

The results are the same if I connect the PC directly to the router or to the switch.

If I boot the PC under Linux, I get the full 40 Mbit in every browser, even the new Edge for Linux.

I tried all that things already and nothing helped:
- New Beta- and Dev-Versions of Edge
- Resetted Windows network and firewall settings
- Replaced network cable and used another port on the switch
- Resetted the router to factory defaults
- Installed completely fresh Windows 10 and formatted the SSD completely. I tried version 1909 and 20H2.
- New network cards: TP-Link TG-3368, Intel Gigabit CT Desktop Adapter, USB 3.0 to Gigabit-Ethernet-Adapter. The first one was an Intel I219-V OnBoard on the Asus Z170 Pro Gaming mainboard.

Everywhere the same problem. Upload stucks at 4 Mbit in Edge. Even after re-installing a fresh Windows.
I also installed Windows 10 with Bootcamp on the MacBook Air and have the same problems at an also completely fresh installation.

I don't understand it anymore.
I think that Microsoft produced a bad bug here anywhere, cause the same Hardware is working under Linux with full 40 Mbit upload and also all other non-Windows-clients do reach the full 40 Mbit everytime.

I thought that maybe some Windows settings were screwed up, but the same problem appeared on completely fresh Windows installations.

Do you have any idea how to solve that, or do you see similar problems?

:)

 

Wifi connection speed decreased from 120 Mbit/s to 40 Mbit/s after Win 10 Security Update KB4493509

I'm using Win 10 Pro and my Internet connection speed (cable) is 120 Mbit/s. I'm using Realtek 8811CU Wireless USB Wifi Adapter. My Wifi connection speed was about 120 Mbit/s. But after Win 10 Security Update KB4493509, wifi connection speed decreased to
40 Mbit/s, even the Wifi Adapter driver updated by Win Update as well. When I uninstall the update, connection speed becomes 120 Mbit/s again. What's the problem?

 

I can see a network with Bandwidth 1733 Mbit/s

I have a new modem which have 2 wi-fi network

• one with network with Bandwidth 130 Mbit/sWhy and
• othe network with Bandwidth 1733 Mbit/s

My laptop (samsung NP270E5E) just see the slowly and I can not see a wi-fi network with Bandwidth 1733 Mbit/s

 

Download & Upload question

Thnx alot Greg Carmack, i did the steps and @step 7 my problem of loosing upload speed (i must have 4 Mbit and had 0.2 Mbit) seems to be solved. Man for weeks i was struggling and now that those programs removed the antivirus free prgs, i have my 4 Mbit
again.

I am no expert but it was like my download stayed ok but some threads stole over the 3 Mbit upload.

Ok thx alot again man, my pc is going 40 Mbit download and 4 Mbit upload again, i still cannot believe those 2 prgs in step 7 did solve my problem so good and fast.

Now im having Win 10, Windows Defender and if needed Mbam & Adwcleaner stand by, but to be honest i am cured in trying free antivir software.

For this year i will upgrade the programs you advised in step 7, just because i am so thankfull they did the Job i could not.

Greetings from an old computerfan, yep the Vic-20 was my first computer. (plz forget the gramar i do not use spelling software)