Global VPN Client greatly slows internet when connected AND not connected / WiFi issues with Creators Update

Global VPN Client greatly slows internet when connected AND not connected / WiFi issues with Creators Update

ISSUE :

I have the Sonicwall Global VPN Client and Windows 10. When I open the client on my computer, my internet slows to a crawl. It goes from ~300Mbps to <1Mbps, often less than 1Mbps. 

Inexplicably, this happens as soon as I open the client. Without even connecting to a VPN. The slowdown happens with or without the VPN connected. As soon as I shut down the client, my network speed goes back to normal. 

SOLUTION :

Solved!

Evidently this is an issue with Windows 10. The solution is to disable Receive Segment Coalescing on the wireless adapter. Microsoft actually provides an automated fix as a download. It worked like a charm. I am back to my 50-80 Mbps download speeds with the VPN client running. 

Details can be found at the following Microsoft Answers link:

https://answers.microsoft.com/en-us/windows/forum/windows_10-networking/wifi-issues-with-creators-update/4a20ba4f-33dc-4397-9823-e12dcb2607ba?auth=1

(Recommended by Microsoft):

Disable “Receive segment coalescing” (Rsc)on your wireless adapter

Steps to disable Rsc using Microsoft’s automated tool:

1) Download the “.diagcab” file located here:

https://aka.ms/diag_cssemerg11005

2) Run it, and let it see if it can determine the problem and fix it.

3) Re-test your wireless internet connection.

If you’d rather do it manually, then I have those steps below.

SOLUTION WHICH I TRIED:

Steps to disable Rsc manually:

1) Open an Admin Command Prompt window:

Start > All Apps > Windows System -> Right-click "Command Prompt" > More > Run as administrator

2) Get your network adapter name:

powershell Get-NetAdapter

3) Note your adapter's name (mine is: Wi-Fi)

4) Get your network adapter "Receive segment coalescing" (Rsc) settings:

powershell Get-NetAdapterRsc

... Mine listed a table that had 1 row, for adapter name Wi-Fi, that had IPv4Enabled True, and IPv6Enabled True

5) Disable Rsc for your network adapter:

powershell Disable-NetAdapterRsc -Name ADAPTER_NAME_FROM_BEFORE

... Be sure to replace ADAPTER_NAME_FROM_BEFORE with whatever your network adapter name is, without quotes

6) Verify Rsc is disabled for ipv4 and ipv6, on your network adapter:

powershell Get-NetAdapterRsc

... Should now show IPv4Enabled False, and IPv6Enabled False, for your network adapter

7) Re-test your wireless internet connection.

SS OF POWER SHELL :

SPEED TEST - AFTER DISABLING RSC :