Windows 11 is limiting my internet speeds

This is for Lester BernardReyes, hoping you'll get this message - I HAD a problem with my internet upload speeds, my Spectrum downloads run about 550 and normal upload is around 21. However on one computer, I only had upload speeds of 2 to 4. I found you answered that question back in 2021 with almost the exact same set of instructions as given here. The first time I did just the WWAN step, turned it off and turned it on, and it fixed the upload. 2 days later it was down to under 1 - download was still 550+. So I tried again, no change. So I followed the second set of instructions (netsh and ipconfig). NOW, INSTEAD OF 550+ DOWNLOAD, I HAVE ONLY 70 DOWNLOAD. Upload continues in the 4 to 6 range. WHAT HAPPENED?? How do I get my original settings back to download at 550+ ????

Hey Robert, I had the same problem as you. After following the second set of steps, my download speeds shot down. To fix it, you can follow the steps here to see the explanations https://pureinfotech.com/disable-window-auto-tuning-fix-slow-internet-speeds-windows-10/ , or just type this into admin cmd, "netsh int tcp set global autotuninglevel=normal". Hope this helps.

"just type this into admin cmd, "netsh int tcp set global autotuninglevel=normal". took me from 150 to 279 on wifi where I have a 1gb speed @ router.

Changing WLAN Autoconfig and WWAN Autoconfig helped me. Not sure what happened. I didn't change any settings and didn't even know these settings existed until today. Thanks Bernard.

Have you tried this, I have stumbled upon this recently and has made a night and day difference in my wired connection speed.

I bought a new network card because I suspected that at fault but it was something inside Windows 11 holding it off.

In Group Policy Editor ( Run > gpedit.msc ) navigate to Computer Configuration > Windows Settings > Policy-based QoS

Right click Policy-based QoS and then select Advanced QoS Settings.

On the Inbound TCP Traffic tab - ensure "specify the inbound TCP throughput level" is ticked and level 3 (maximum throughput is selected).

It seems by default in Windows 11 this is not ticked and behaves unexpectedly.

I tested my connection using Speedtest.net.

This fixed my problem where the download speed would steadily incease but never reach the speed at my router and other devices.

The upload was capped at around 190Mbps using Google Chrome. Microsoft Edge however had no problem reaching the full bandwidth from my ISP.

The ping on Speedtest.net never fluctuated as you would expect when downloading or uploading at higher speeds before I applied this.

This did not work for me. Question, after I followed the instructions, is my PC now OK or do I have to do any manual steps to reset things?

Holy smokes, that worked. Thank you thank you thank you thank you!!!!!!!!!