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Copper Contributor

Jul 30, 2021

sudden slow internet speed on windows 11

recently I updated my windows 10 to windows 11. after that my download speed is suddenly decreased my actual internet speed is 25mbps when I check on the speed test also its showing 25mbps but while ...

Copper Contributor

Nov 18, 2021

Disabling the IPv6 did the trick for me!

How I did it:

Go to Control Panel\Network and Internet\Network Connections
Right Click the connection type (Wifi, Ethernet...) and go to Properties
Uncheck 'Internet Protocol Version 6...'
Restart

Massive changes here on both, wifi and cable.

Hope this helps! 🙂

mroliveira
Copper Contributor
Nov 19, 2021
Guys,

I did a few tests toggling IPv6 and it turns out that the wifi was just oscilating.
It seems that the problem here is related to my router.

My cellphone gets better speeds, so Windows 11 is probably causing some issues, nut it was not the IPv6.

Sorry for the false positive. 😞
- astronork
  Copper Contributor
  Mar 21, 2025
  Well, disabling IPv6 worked for me - went straight from 25Mbps to 211Mbps. Router shows no sign of oscillating (yet).
- spline
  Copper Contributor
  Nov 19, 2021
  use only 5ghz Wifi, it works
Keyword
Copper Contributor
Nov 18, 2021
mroliveira
Have already tried this and it made no difference. Thanks for the help
Don
- hvulpus
  Copper Contributor
  May 25, 2025
  I had the same problem on several computers I updated to Windows 11. Most notably, my desktop which is connected via wifi went from ca. 600Mbps to ca. 150 when I went to 11. A cell phone held nearby was in the 500s.
  It turns out that you need a 6E wifi connector. When I installed a Netgear AX8000 Nighthawk, the thing bumped up to 600Mbps immediately.
  Don't know why this is not common knowledge.

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