Question XPS 15 - 9575 Killer Wifi 1435 Halving all Wifi speeds

[sean.thankscr]

So I've had this laptop for a few years now, I don't see a need for me to upgrade/buy a new laptop as it still does what I need it to.
The problem is that from time to time the Killer Wifi 1435 wifi chip would halve my internet speeds.
It's been constantly halving the wifi speed for about a month now.

My home internet on any of my other devices, Smarthphones (iPhone 8, LG V60, Xperia 1) and my other laptops (VAIO svf15N1A1J, ACER alpha swift 12) all had a download speed of 45mb/s (around 350mbps) but only on this laptop with the killer wifi chip I only get about halve of that. I have tried updating the Drivers, the killer software, the bios the windows updates, even upgrading to windows 11 to no avail.

After I change any wifi setting say the MTU or the driver things whe I first download I can get 45mb/s for about 2 seconds before it throttles down to 18-31mb/s (not really stable goes up and down).

How is my 13 year old VAIO doing better than this, is it perhaps the killer wifi chip?? Is it a Windows 10 2004 issue? I recall not having this issue on the 1906 windows 10 build I used to run on this laptop....

Right now I have disabled all the Killer wifi drivers and software from services and startup, but there might be hard coded "optimizing" setting that I don't know how to remove....

Oh and in speed test the upload is getting the full speed
Download Mbps
272.58
Upload Mbps
353.67

 

[Lutfij]

the bioe the windos updates, even upgrading to windows 11 to no avail.
Did you get to Windows 11 using the internal upgrade process? If you did you should reinstall the OS. Atheros/Qualcomm/Killer's WiFi and NIC adapters were all affected when Windows 10 rolled up. The issue was resolved by updating the BIOS and manually installing either the latest drivers for the networking adapter or installing the driver(meant for an older OS) in compatibility mode;
i.e, Right click installer>Properties>Compatibility mode>Windows 7/8(from the drop down menu).

Is it a Windows 10 2004 issue?
Windows 10 is now on 22H2, if you're on 1906, the OS needs updating and then installing the driver in compatibility mode, if there are no drivers after Windows 10's release date.

 

[sean.thankscr]

the bioe the windos updates, even upgrading to windows 11 to no avail.
Did you get to Windows 11 using the internal upgrade process? If you did you should reinstall the OS. Atheros/Qualcomm/Killer's WiFi and NIC adapters were all affected when Windows 10 rolled up. The issue was resolved by updating the BIOS and manually installing either the latest drivers for the networking adapter or installing the driver(meant for an older OS) in compatibility mode;
i.e, Right click installer>Properties>Compatibility mode>Windows 7/8(from the drop down menu).

Is it a Windows 10 2004 issue?
Windows 10 is now on 22H2, if you're on 1906, the OS needs updating and then installing the driver in compatibility mode, if there are no drivers after Windows 10's release date.

I tried with internal upgrade process and with clean os reinstall (Both Windows 10 and 11). I have downgraded the Bios back to factory to enable undervolting.