Disabling Large Send Offload v2 for Faster Upload Speeds
If you have a 1 Gig download/upload connection and you're only getting 940-ish Mbps on your Ethernet-connected Windows 11 machine with a 2.5 Gig network card, you might want to consider disabling Large Send Offload v2 (LSO v2) to improve your upload speeds.
What is Large Send Offload v2?
Large Send Offload (LSO) is a feature that allows the network card to handle large packets of data more efficiently. It reduces the CPU overhead by allowing the network card to fragment large packets into smaller ones before sending them over the network. This feature is available in two versions: v1 and v2.
LSO v1 is designed for IPv4 traffic, while LSO v2 is designed for IPv6 traffic. LSO v2 uses a different algorithm to fragment packets, which can cause issues with some network configurations, resulting in slower upload speeds.
How to Disable Large Send Offload v2
To disable Large Send Offload v2, follow these steps:
- Press the Windows key + X and select
Device Managerfrom the menu. - Expand the
Network Adapterscategory. - Right-click on your network adapter and select
Properties. - Click on the
Advancedtab. - Find the
Large Send Offload v2 (IPv6)option and set it toDisabled. - Click
OKto save the changes.
After disabling LSO v2, restart your computer and check your upload speeds again. You should see an improvement in your upload speeds.
References
- Microsoft Docs: Large Send Offload Energy Efficiency (LSO-EE)
- Reddit: Windows 10 - 1 Gigabit upload speeds are slow
- Super User: Windows 10 network adapter settings - What does "Large Send Offload v2 (IPv6)" do?
In this article, we discussed how to disable Large Send Offload v2 to improve upload speeds on a Windows 11 machine with a 2.5 Gig network card. We covered the following topics:
- What is Large Send Offload v2?
- How to disable Large Send Offload v2?
- References
By disabling LSO v2, you can improve your upload speeds and get the most out of your 1 Gig download/upload connection.