Windows 10: Network slows down dramatically shortly after connecting

I've decided to reimage my Dell XPS 9360 and started to experience serious networking problems right after the fresh Windows install. The previous OS installation became unstable but I had no network speed problems at all.

The device is equipped with Realtek USB GBE Controller, which means I need to use the USB adapter to connect the network cable. I can also use the network port built into my TB16 dock, but those docks are known to cause problems and they used to have a bug limiting network speed to 100 Mbps only.

OK, what happens - I install Windows, then latest version of drivers available on Dell's website, and finally run Window Update. When I first connect the cable I am able to get my full expected speed - 500 Mbps, but shortly after the next test shows approx 200 Mbps and few minutes later it's only 80-90 Mbps and this speed remains.

When I unplug the adapter or disable/enable network adapter, for a while I still have 500 Mbps and then the story repeats.

It looks there's some very recent update component that causes this - with my old install I had full speed, and I did a test by measuring the speed before running Windows Update - and the speed was around 500 Mbps constantly.

I've applied some common ethernet optimizations (e.g. turn off offloads, disable energy efficient enthernet etc.), but it wouldn't help - the issue is clearly linked to some Windows component.

Anyone can advise me on this? What else can I try?

:)

 

Losing network connection

Hello Dear, if you have a laptop or a PC with a wireless network adapter, you can see a list of available wireless networks and then connect to one of those networks. The wireless networks will only appear if your PC has a wireless network adapter installed, the adapter is turned on, and the wireless access point is in range.

1. Click Start, click Control Panel, click Network and Internet Connections, and then click Network Connections.

2. In the left pane, under Network Tasks, click View available wireless networks.
In case, If you don't see the network you want to connect to, click Refresh network list. If you see the network but the signal is weak, move the PC closer to the wireless router.

3. Click the network you want to connect to, and then click Connect.

4. If you're connecting to a secure network, type the security key, and then click OK.

I Hope you solve out your query soon.

 

No network connection

Hello Graham,

To resolve your concern about wireless network issues, please click the link below and follow the suggested troubleshooting steps:

• Fix network connection issues in Windows 10

Let us know how it goes.

 

Slow internet connection from Wifi - Network adaptor

Hi Maegen,

Slow internet connection could be due to outdated network adapter driver or Wi-Fi signal interruptions.

We would like to know some additional information to better isolate the issue:

• Have you tried updating your network adapter driver?
• Do you have any anti-virus or 3rd party security app running?
• Is your computer updating Windows or other programs?
• Have you done any changes on your computer prior to the issue?

In the meantime, we suggest that you try to run Network Adapter troubleshooter and
Internet Connection troubleshooter. It will find and fix problems with wireless network adapters and Internet connections. Follow the steps provided below:

• Press Windows key + X and select Settings.
• Click Update & Security, then choose Troubleshoot.
• Click Internet Connections and Network Adapter.
• Click Run the troubleshooter.

We will wait for your response.