What does the "TCP: Disable Autotuning/Heuristics" tweak change in Windows?

It runs cmd /c netsh int tcp set global autotuninglevel=disabled and 1 more command. The full list is in the table on this page, read from the app's source.

Is "TCP: Disable Autotuning/Heuristics" safe to switch on?

Usually a net loss. Keep auto-tuning at 'normal' unless you have a router problem this is known to fix. The main cost: Download speed can drop sharply on fast connections, because the receive window stays small.

Is "TCP: Disable Autotuning/Heuristics" free in Frozen Tweaks?

It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

netsh int tcp set global autotuninglevel: should you disable TCP auto-tuning for gaming?

Frost LIVENetworkProUndo: YesUpdated Oct 8, 2026View as Markdown

Short answer

Updated Oct 8, 2026

Receive window auto-tuning lets Windows grow the TCP receive buffer so fast downloads can use the whole connection. This tweak disables auto-tuning and the related heuristics with netsh. It runs cmd /c netsh int tcp set global autotuninglevel=disabled and 1 more command.

In the app

TCP: Disable Autotuning/HeuristicsPRO

Command

cmd /c netsh int tcp set global autotuninglevel=normalcmd /c netsh int tcp set global autotuninglevel=disabled

What the switch writes. Your current value may differ. 1 more change below.

What it does

Receive window auto-tuning lets Windows grow the TCP receive buffer so fast downloads can use the whole connection. This tweak disables auto-tuning and the related heuristics with netsh.

In the app the switch is called "TCP: Disable Autotuning/Heuristics", described there as: Flattens congestion window behavior to reduce jitter on some ISPs.

When it helps, and when it hurts

When it helps

A small number of routers and providers that handle window scaling badly, which shows as stalls or unstable speeds.

When it hurts

Download speed can drop sharply on fast connections, because the receive window stays small.
Most games send their gameplay traffic over UDP, which this setting does not touch.

What it writes

Exactly what the switch changes, read from the app's source. Switching it off is what the app writes when you turn the tweak off again.

With the tweak · CMD

cmd /c netsh int tcp set global autotuninglevel=disabled
cmd /c netsh int tcp set heuristics disabled

Switching it off · CMD

cmd /c netsh int tcp set global autotuninglevel=normal
cmd /c netsh int tcp set heuristics enabled

From the app's source (tcp_autotune_off.hpp), app 2.0.0, checked Oct 8, 2026.

How to undo it

In the app: Yes

Switching it off sets a standard Windows value, which may not be exactly how you had it.

Switch the tweak off in Frozen Tweaks. It runs the commands shown under "Switching it off".

Changing several settings at once? The app's Make a restore point button, on every plan, makes a Windows restore point before you start.

Verdict

Usually a net loss. Keep auto-tuning at 'normal' unless you have a router problem this is known to fix.

Questions

What does the "TCP: Disable Autotuning/Heuristics" tweak change in Windows?: It runs cmd /c netsh int tcp set global autotuninglevel=disabled and 1 more command. The full list is in the table on this page, read from the app's source.
Is "TCP: Disable Autotuning/Heuristics" safe to switch on?: Usually a net loss. Keep auto-tuning at 'normal' unless you have a router problem this is known to fix. The main cost: Download speed can drop sharply on fast connections, because the receive window stays small.
How do I undo it?: Switch the tweak off in Frozen Tweaks. Switching it off sets a standard Windows value, which may not be exactly how you had it.
Is "TCP: Disable Autotuning/Heuristics" free in Frozen Tweaks?: It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

In the app