Wi-Fi Slowness with SonicWALL GVC, Windows

May apply even without SonicWALL GVC installed


Ref article

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



Workaround #1

Disable "Receive Segment Coalescing" (Rsc)

Steps to disable Rsc manually:

1) Open an Admin Command Prompt window:
  Right-click "Command Prompt" > 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

5) Disable Rsc for your network adapter:
  powershell Disable-NetAdapterRsc -Name ADAPTER_NAME_FROM_STEP3

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



Workaround #2

Change MTU to 1400  (from Default usually 1500)

1) Open an Admin Command Prompt window:
  Right-click "Command Prompt" > Run as   administrator

2) View MTU Setting:
  netsh interface ipv4 show subinterfaces
  ...make note of wireless interface name

3) Change MTU to 1400
  netsh interface ipv4 set subinterface "YOUR_WIRELESS_INTERFACE_NAME" mtu=1400 store=persistent