Speed Issue

[SH]

This issue i have noticed on my friends windows 10 computers, where internet speed looks capped …

Symptoms – 

– > Recently you have upgraded your internet connection speed from 150Mbps to 500Mbps connection …….but still getting 150Mbps via Ethernet Cable or Wi-Fi  on particular windows  computer , but all other devices are maxing ISP allocated speed and  ISP tech are unable to resolve your issue
——————————————————————————-
Things You Have Already Checked – 

1) – LAN Cable ( It’s already CAT5e , CAT6, CAT7 and CAT8 )
2) – Ethernet Port on modem is capable to handle 1000Mbps+
3) – Checked LAN and Wi-Fi Adapters ( they are capable of LAN – 1000 Mbps , Wi-Fi – 2×2+ AC,AX adapter ) + Updated Drivers to latest version
4) –  Reset LAN and Wi-Fi Drivers …. and connect to 5Ghz Wi-Fi ( if testing on Wi-Fi )
5) – There is no QOS software installed on Computer like ASUS GAME V or Killer Networking Suite

If everything feels correct ………………and issue still persist

Solution:- 

1) – Search for Command Prompt
2) – Right Click and run it as administrator
3) – Type or Paste  “netsh interface tcp show global”   without quotation mark and press enter
4) – check what -> Receive Window Auto-Tuning Level <- is set to in result
> > Auto Tuning level can be set to any of the following values
A) – disabled: Fix the receive window at its default value.
B) – highlyrestricted: Allow the receive window to grow beyond its default value, but do so very conservatively.
C) – restricted: Allow the receive window to grow beyond its default value, but limit such growth in some scenarios.
D) – normal: Allow the receive window to grow to accommodate almost all scenarios.
E) – experimental: Allow the receive window to grow to accommodate extreme scenarios.

5) – This issue occurred when Auto Tuning level is set to disabled
6) – Default Auto Tuning level is normal .. to set it ……… Type or Paste “netsh interface tcp set global autotuninglevel=normal” without quotation mark in Command Prompt window you opened at step 2 and press enter

for precaution …reboot and than check speed again

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[UK Sentinel]

I assume you are an IT professional (day job) ;-)

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