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Mad Scientist
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  Reply # 1467136 10-Jan-2016 18:11
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forum.notebookreview.com/threads/dell-xps-13-2015-wifi-problems.770860/page-2



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  Reply # 1467141 10-Jan-2016 18:28
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joker97: If you are connected at 144Mbps to your router, that is one issue [either at router end or Dell end] ... may or may not explain everything.

If connected at "N", should be 300Mbps, if "AC", should be 750-850Mbps.

Can you disable 2.4GHz on your router and ensure enable WWM/QOS and 20/40/80MHz enabled on the 5GHz channel


As suggested, I have disabled 2.4HGz on the UniFi, and changed from 40MHz to 80MHz. (the only options are 20 or 40 or 80)

There has been an immediate improvement in performance.
The Network centre now shows more than 500Mbps (varies with location).
I can now get full line speeds on the Dell, just like the Vaio.
The Lan speed test is now above 100 Mbps:

Click to see full size

(click to view)


As a background to all this, wireless performance was so poor on delivery that after a week I tried to install newer Dell network drivers (from the Dell website).
This was a disaster, with complete loss of wireless connectivity.
So i wiped the hard drive, reinstalled Windows 10 (easy) and all the latest Dell drivers (very difficult).

I discovered the hard way that most of the drivers would not install without dot net 3.5 - this was NOT mentioned on the Dell website. undecided

I am still not convinced that all the network drivers re-installed correctly, although the Device Manager states that they are all installed and up-to-date.

Thank you all for your help.






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  Reply # 1467168 10-Jan-2016 19:08
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Dells website is a bit of a nightmare in terms of downloading drivers, and getting the right one for the machine and OS. It actually used to be quite good when I purchased my first one 10 years ago. But they have dumbed it all down, and not have systems where it will keep all your drivers up to date and install them automatically, if you trust them to do this. I also had some form of malware alert from security essentials, that was detected to be from their software.

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  Reply # 1467171 10-Jan-2016 19:15
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Sideface:
joker97: If you are connected at 144Mbps to your router, that is one issue [either at router end or Dell end] ... may or may not explain everything.

If connected at "N", should be 300Mbps, if "AC", should be 750-850Mbps.

Can you disable 2.4GHz on your router and ensure enable WWM/QOS and 20/40/80MHz enabled on the 5GHz channel


As suggested, I have disabled 2.4HGz on the UniFi, and changed from 40MHz to 80MHz. (the only options are 20 or 40 or 80)

There has been an immediate improvement in performance.
The Network centre now shows more than 500Mbps (varies with location).
I can now get full line speeds on the Dell, just like the Vaio.
The Lan speed test is now above 100 Mbps:

Click to see full size

(click to view)


As a background to all this, wireless performance was so poor on delivery that after a week I tried to install newer Dell network drivers (from the Dell website).
This was a disaster, with complete loss of wireless connectivity.
So i wiped the hard drive, reinstalled Windows 10 (easy) and all the latest Dell drivers (very difficult).

I discovered the hard way that most of the drivers would not install without dot net 3.5 - this was NOT mentioned on the Dell website. undecided

I am still not convinced that all the network drivers re-installed correctly, although the Device Manager states that they are all installed and up-to-date.

Thank you all for your help.




I wouldn't worry too much about the LAN speed test, as, you have discovered, AC wifi speed is very sensitive to distance from router and walls in between. So it fluctuate a bit.
In summary, the Network Centre showed initial wifi connection speed of 144, there was the answer right there.
A tweak of the router and you're laughing.
Luckily it wasn't the Dell end ...

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  Reply # 1467247 10-Jan-2016 21:14
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@Sideface those speeds still dont look great for wifi AC are you sure its not connected via N on the 5ghz band?



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  Reply # 1467261 10-Jan-2016 21:46
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Jase2985: @Sideface those speeds still dont look great for wifi AC are you sure its not connected via N on the 5ghz band?


A distinct possibility.

My WiFi status speed is currently 702 Mbps.

(Re)installing the network card drivers was a nightmare.

Watch this space.




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  Reply # 1467295 11-Jan-2016 05:41
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if you are connected at 702mbps then you should be seeing at least 300mbps of actual throughput

i get 200+mbps from 390mbps connected speed.

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  Reply # 1467297 11-Jan-2016 07:03
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That's assuming both computers have SSDs capable of that, assuming the network card / driver and router is up to scratch. As i said my Huawei gives 1/3 throughput to anything connected to any of its Wi-Fi.

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  Reply # 1467350 11-Jan-2016 09:16
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a sata 3 HDD should be more than enough to read/write to 60MB/second (480mbps)

if you are getting 1/3 of the throughput then something in your setup is causing the slowdown

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