Hello,
I had same issue. It was solved for me via following command in cmd. Previous value was disabled.
netsh int tcp set global autotuninglevel=normal
Windows 10 limiting my internet speed?
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Anonymous
I have a PC running windows 10, all of the latest updates have been installed and drivers are up to date and it is connected to a ethernet cable for internet. I have a gigabit ethernet service. When I run an internet speed test I get somewhere between 14 -40 Megabits/sec download and 15-30 Megabits/sec upload (on a good day). When I connect my laptop to the same ethernet cable my download speed is between 650 and 750 Megabits/sec and my upload is closer to 50 Megabits/sec. I have tried many suggestions online such as turning off automatic updates, and removing the reserve bandwidth for updates. changing the network adaptor settings to force gigabit speed rather than auto assign. I have even tried installing a new gigabit network card to see if it was a motherboard issue and no luck. I cant seem to find anything online to help me resolve this issue. Please help.
Windows for home | Windows 10 | Internet and connectivity
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Anonymous
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Anonymous
2021-05-13T15:41:06+00:00 Here's a bit more info:
TCP Global Parameters
Receive-Side Scaling State : enabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : default
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Initial RTO : 1000
Receive Segment Coalescing State : enabled
Non Sack Rtt Resiliency : disabled
Max SYN Retransmissions : 4
Fast Open : enabled
Fast Open Fallback : enabled
HyStart : enabled
Proportional Rate Reduction : enabled
Pacing Profile : off
Disabling the "Receive Window Auto-Tuning Level" actually worsened the speeds.....very very strange
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Anonymous
2021-05-13T16:39:55+00:00 Update. Seems crazy, but I totally disconnected all plugged-in USB devices, my HDMI connection, audio out to external speakers, disconnected the Ethernet connection again, turned on my wifi and BAM! 480+Mbps speeds! I reconnected everything, tested again and still had full speed down/uploads!! I rebooted, still have full speeds again....go figure.
After 35 years of computers, I still scratch my head at times......
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Anonymous
2021-05-22T19:22:40+00:00 Thanks for this KOMB... I had been struggling with what seemed to be a throttling issue on downloads lately. I tried this first part and it fixed my issue!
Thanks so much!
P
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Anonymous
2021-05-28T17:44:56+00:00 Assuming your original value was 'normal', set back to normal:
netsh int tcp set global autotuninglevel=normal
THANK YOU SO MUCH!!!!! I almost gave up until I decided to put it on normal like you said since mine was already disabled I didn't change it because of the tutorial the first guy was giving but normal did the trick! now for those that are using LAN cable like me and you aren't getting your actual speed for example if if you are like me and your internet is supposed to be 1200 download speed but you only get 900 or 1000 download it could be because the LAN cable you are using only supports 1000 speed max like the CAT .5E LAN cable that i have at the moment which in that case you will need the CAT.6A LAN cable or greater. (do some research on the different LAN cables that are out there)