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Windows 10 1903 Update Capped my Internet Speed

Prior to the update to 1903, 

I have Spectrum Internet and pay for there 400 Mbps connection. Prior to the update to 1903 i would get 350+ Mbps threw fast.com and speedtest, Now after the update it seems the internet test is capped at 150-160 Mbps which is half of what im paying for.

As windows 10 is an OS that is a one time payment I would like to know why an Update has capped my internet speed or why this should even been a problem with an OS Update? From what i've seen searching this is not the first time a windows update has screwed with end users internet speeds.

I've tested my laptop which is still running an earlier version of windows 10 prior to the 1903 update and it sees the 400 Mbps speeds, so this is specifically a 1903 Update issue.

Answer
Answer

I've been searching for a fix for this for a while, luckily i recently found one.

This is the command i used to fix it.

netsh int tcp set global autotuninglevel=normal

Run that in command prompt and it should help.

For others still having trouble, make sure you run command prompt as administrator before running the command.

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Question Info

Last updated September 6, 2023 Views 12,636 Applies to: