February 2, 2026, 3:16 pm | Read time: 3 minutes
When it comes to internet connections, it’s not just about data throughput but also security and stability. A Fritzbox continuously evaluates which data packets need to go through the full route–including the firewall and user filters–and which can arrive faster. Fritz calls this process “packet acceleration.” TECHBOOK explains what this feature does and when you should turn it on or off.
How Packet Acceleration Works on the Fritzbox
The Fritzbox sends the first data packet of every connection through the complete routing stack. This includes security measures like firewall rules, user filters, parental controls, prioritization, etc. Once the connection is deemed secure, packet acceleration kicks in. It ensures that subsequent packets no longer have to go through the entire process and are forwarded more quickly.
In a YouTube video, Fritz explains that the function is enabled by default. Without packet acceleration, the Fritzbox checks each individual data packet, which can lead to delays during gaming. The setting is so crucial that it automatically reverts to the default after a Fritzbox restart–including after an update.
However, when troubleshooting, it can be helpful to change the function’s settings. In some cases, users report on Reddit that turning it off resulted in a more stable connection, as fewer data packets were lost.
Where to Turn Packet Acceleration On and Off
The options for packet acceleration are somewhat hidden in the Fritzbox settings, as they are primarily intended for support cases:
- Select “Help and Info” in the sidebar.
- Click on “Fritzbox Support” at the bottom of the page.
- Scroll to “Packet Acceleration“.
There, users will find several levels of packet acceleration that build on each other:
- Packet acceleration active: The internal Fritzbox software optimizes the routing process.
- Layer-2 acceleration active: Optimizes packet throughput in the local network–for example, when two Fritzboxes communicate directly with each other.
- Hardware acceleration active: Offloads the routing process from software to hardware to further speed up the process.
Also interesting: A secret setting makes your Fritzbox even faster!
Turning off the individual options is likely to result in noticeably slower data throughput–especially if hardware acceleration is disabled first, followed by software acceleration. Generally, packet acceleration should only be turned off in emergencies. Changes are saved until the next restart by clicking “Apply Settings.”