Slow wi-fi on laptop, fast on other devices

[veronika0benesova]

Hey, I hope someone will be able to help me.

My wi-fi connection started being extremely slow. I have a 20Mbit/s connection, although speed test says my download is only 5-6Mbit/s over wi-fi.
I tried checking the download speed with cable and it was around 19Mbit/s, which is okay. I have also tried checking the wi-fi speed with other devices and it was around 18Mbit/s. So it has a to be a problem with my network adapter.

I have tried:

running diagnostics
netsh reseting (ipv 4 and 6)
running sfc /scannow, DISM
updating my router firmware
changing settings in inetcpl.cpl
removing the wi-fi from known networks
reinstalling drivers/network adapter
disconnecting all devices from the network except my laptop
checking if there are any processes that would slow down my network
disabling antivirus
updated Windows with 1709
boot into safe-mode with networking


and none of these steps worked. However, checking the events for my network adapater, I've found that there was an 441 error - device could not be migrated. Also, I have noticed that there were 8 new devices (all of them Wan Miniport), so I uninstalled them and restarted, also no luck. What is it and why did it suddenly appear in device manager? Could that be the problem? I managed to remove them permanently after finding out that they might be causing problem with network speed but nothing has changed. This started happening only a few days ago, no other changes that would possibly cause that.
I'm kinda desperate because I seriously don't know what caused that, it's been working fine for years and I have no idea what to do next.

I'm using a Broadcom 801.11n network adapter, Windows 10
What else should I try?
Are there any background processes that might be causing this?
Is there anything that is worth trying?
Thank you very much in advance.

 

[helpstar]

the wan miniports are normal and shouldn´t be uninstalled or disabled.

try another wlan adapter

which wlan adapter is it and which driver versions did you try?

here some more suggestions:
https://support.microsoft.com/en-us/help/10741/windows-10-fix-network-connection-issues

 

[veronika0benesova]

the wan miniports are normal and shouldn´t be uninstalled or disabled.

try another wlan adapter

which wlan adapter is it and which driver versions did you try?

here some more suggestions:
https://support.microsoft.com/en-us/help/10741/windows-10-fix-network-connection-issues

thanks for you reply, I tried every solution listed on that site :/ I forgot to mention that disabling firewall temporarily didn't help either. My wlan adapter is Broadcom 801.11n BCM43XNG, Current driver is version 6.30.223.256.

 

[The Paladin]

1. what frequency is your laptop connecting to ie 2.4GHZ or 5GHZ ?
2. what frequency your other device connecting ? most modern phones run at 5GHZ.

 

[helpstar]

which laptop is it exactly? Have a look at the bottom, there should be a label with the detailed model number

try ubuntu live booted from an usb flashdrive.

 

[veronika0benesova]

1. what frequency is your laptop connecting to ie 2.4GHZ or 5GHZ ?
2. what frequency your other device connecting ? most modern phones run at 5GHZ.

My other devices are connecting at 2.4Ghz, laptop too, because my router is an old 802.11b/g/n single band, if I'm correct.

 

[veronika0benesova]

which laptop is it exactly? Have a look at the bottom, there should be a label with the detailed model number

try ubuntu live booted from an usb flashdrive.

Good idea, I have a bootable usb flashdrive of ubuntu, will try that tomorrow. My laptop is Lenovo Ideapad G580 20150.

 

[veronika0benesova]

1. what frequency is your laptop connecting to ie 2.4GHZ or 5GHZ ?
2. what frequency your other device connecting ? most modern phones run at 5GHZ.

So I just checked the settings in my computer and my network adapter is set to 802.11.b/g/n auto which I guess means it only supports 2,4 GHZ am I right? Not really familiar with this :/

 

[helpstar]

"n" standard can theoretically work with 5GHz, but it´s not implemented in your broadcom chip. "Only" 150Mbps at 2.4GHz max.
If in Ubuntu it doesn´t work well too, test the speed right beside the wifi router. Maybe location is not that optimal?

Try right clicking on the broadcom in the device manager and click update driver there

update your BIOS of the laptop:
https://pcsupport.lenovo.com/de/de/products/laptops-and-netbooks/lenovo-g-series-laptops/lenovo-g580-notebook/20150/downloads