How Can SMB Compression Speed Up Windows 11 File Transfers?
Windows has a feature called SMB compression. It shrinks files as they move across your network. Why? To reduce the amount of data sent, which makes transfers faster. What happens? Your large files move quicker, especially over slower or remote connections.
Important Disclaimer: Windows 11 24H2 Performance
If you recently updated to Windows 11 24H2, you might notice slower robocopy-to-copy-network-files-faster-in-windows-11/" class="sal-link" rel="noopener" target="_blank" data-sal-id="26126">file transfer speeds. This is a known performance regression. Before changing settings, ensure your network drivers are updated. Specifically, users with an I226-V NIC often see issues. Check your manufacturer website for the latest driver versions to resolve these bottlenecks.
How to Enable SMB Compression
SMB compression is usually on by default. If you need to verify or force it, follow these steps.
- Press Windows key + R to open the Run dialog.
- Type
powershelland press Ctrl + Shift + Enter to run as Administrator. FLAG: Admin privileges required. - Run the following command to force compression:
Set-SmbClientConfiguration -CompressForce $true. - Visit the official Microsoft Learn article for more technical details.
Troubleshooting Slow SMB Transfers
Advanced Network Optimization
To improve throughput, check if SMB Multichannel is active. This allows Windows to use multiple network paths simultaneously. You can also compare SMB Over QUIC, which is great for remote internet transfers, versus standard TCP for local networks. If you suspect a bottleneck, use the command Get-SmbConnection to see if your current connection is using compression.
Map and Manage Network Shares
You can map drives or create shares using simple commands. FLAG: Admin privileges required for share creation.
- Map a drive:
net use * \\192.168.1.50\SharedFolder /requestcompression:yes - Create a share:
New-SmbShare -Name "Data" -Path "C:\Data" -CompressData $true - Update a share:
Set-SmbShare -Name "Data" -CompressData $true
Summary
SMB compression helps move files faster by shrinking data. While Windows 11 24H2 has some known performance issues, you can fix them by updating drivers and using PowerShell commands. Always prioritize security by keeping SMB signing active. Use the provided commands to manage your shares and ensure your network is running at its best.” }
Why is my SMB transfer speed slower on Windows 11 24H2?
The 24H2 update introduced network stack changes that can cause performance regressions. This often stems from driver conflicts with specific hardware like the I226-V NIC. Updating your network adapter drivers and checking for Windows updates are the first steps to restoring your expected SMB throughput.
Should I disable SMB signing to improve file transfer speeds?
SMB signing adds a security layer to your data. Disabling it might slightly increase speed, but it makes your network vulnerable to man-in-the-middle attacks. It is highly recommended to keep SMB signing enabled for security, focusing instead on NIC driver optimization and SMB Multichannel settings.
Does disabling Large Send Offload fix slow network speeds?
Large Send Offload (LSO) and Receive Side Scaling (RSS) are designed to offload work from your CPU to the network card. If your drivers are buggy, disabling these in your Network Adapter properties can sometimes stabilize speeds, though it may increase CPU usage during heavy file transfers.
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