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Strange slowdown when using 5GHz Wifi

iaptekar
Hooked
Posts: 5
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Registered: ‎29-06-2019

Strange slowdown when using 5GHz Wifi

I recently purchased a new laptop, a Dell XPS 13" running Windows 10. The first thing I noticed was how slow the update process was of Wifi. Over ethernet everything was blazingly fast, but tests show I was getting <1Mbps over wifi. My other laptop, a MacBook, did not have this problem. Now on my Plusnet Hub One I have split the Wifi into separate 2.4 GHz and 5GHz SSIDs. I realized that my Dell was using the 5GHz one, so I tried switching it to 2.4 GHZ, and hey presto, I was now getting downloads of 40Mbps!

 

Any ideas what the problem is? The NIC on the laptop is a Killer Wi-Fi 6 AX 1650s 160MHz, could this be at fault? The Hub One firmware is 263, is this too old? Everything is updated to the latest versions. My other laptop does register a slight decrease in speed going from 5GHz to 2.4GHz, however is it no so dramatic as with my Dell.

7 REPLIES 7
Baldrick1
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Registered: ‎30-06-2016

Re: Strange slowdown when using 5GHz Wifi

@iaptekar 

Have you tried the 5GHz band since splitting the bands?

Before blaming the laptop I would try on a different 5GHz network. You have the latest Hub firmware.

iaptekar
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Registered: ‎29-06-2019

Re: Strange slowdown when using 5GHz Wifi

Yes, I am using the split bands. The Dell has a dramatic slowdown on 5 GHz. The MacBook does have a slight slowdown but one I can live with and could be due to interference. To be honest, I'm surprised there is any difference.

 

I will try it on a different network when I get the chance. Stuck at home like most other people at the moment Smiley

ALS57
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Registered: ‎01-02-2017

Re: Strange slowdown when using 5GHz Wifi

I have the same problem with my Dell XPS 15 with the AX1650 card. Did you get to an ideal solution on this?

iaptekar
Hooked
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Registered: ‎29-06-2019

Re: Strange slowdown when using 5GHz Wifi

Nope. Sometimes rebooting the router helps but mostly I just use the 2.4GHz band

bobpullen
Community Gaffer
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Re: Strange slowdown when using 5GHz Wifi

Very peculiar.

@ALS57 also read your post over here with interest.

I've just pushed a software update to both of your routers and I'm interested to know whether or not it's had any positive impact on the issue. Can you both reboot your routers and let me know if there's any change? - Thanks. 

Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵

ALS57
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Registered: ‎01-02-2017

Re: Strange slowdown when using 5GHz Wifi

Hi Bob

 

Excellent that's fixed it!

With the following Network adaptor settings I now get 73.7mb/s Download, 18.5mb/s Upload and 7.8ms data delay, before it was 2mb/s Download.

2gb_per_sec.jpg

 

Can you please confirm that these settings are the optimum settings for plusnet routers (rather than 2.4ghz)?

 

Searching the internet this slow wifi is a common problem for XPS laptops using Killer AX wifi cards. Most people are fixing it by replacing the Killer cards with Intel chips to solve it.

 

Many thanks for you swift solution.

 

Cheers

 

Al

ALS57
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Registered: ‎01-02-2017

Re: Strange slowdown when using 5GHz Wifi