How Can SMB Compression Speed Up Windows 11 File Transfers?
SMB compression speeds up Windows 11 file transfers by shrinking files before they move across your network, reducing the amount of data that needs to be sent.
This intelligent Windows feature identifies compressible data, shrinks it on the fly, and then automatically decompresses it on the receiving computer.
You’ll notice the most significant improvements when transferring large files, especially over slower network connections like VPNs or during remote work. For instance, some tests show potential speed increases of up to 65% with this technology on compatible hardware.
SMB compression speeds up Windows 11 file transfers by shrinking files before they travel over the network. You can ensure it’s active by running the PowerShell command Set-SmbClientConfiguration -CompressForce $true. This feature is most beneficial for large files on slower connections.
Important Disclaimer: 🪟 Windows 11 24H2 Performance
If you’ve updated to Windows 11 24H2, you might notice file transfers are slower than usual. This is a known issue, so before you change any settings, make sure your network drivers are up-to-date, as this can often fix performance dips.
How to Enable SMB Compression
SMB compression helps speed up file transfers by making files smaller before they’re sent. It’s usually turned on automatically, but if you need to check or turn it on, you can use a simple command in PowerShell with admin rights.
- 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 get even faster file transfers, you can try a few advanced tricks. Check if SMB Multichannel is active to use multiple network paths at once, or compare SMB Over QUIC for internet transfers versus standard TCP for local ones.
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 speeds up file transfers by shrinking data, which is helpful even with known Windows 11 24H2 issues. Updating drivers and using PowerShell commands can fix performance problems, while keeping SMB signing active ensures security.
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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About the Author
Richard
Tech Writer, IT Professional
Richard, a writer for Geek Rewind, is a tech enthusiast who loves breaking down complex IT topics into simple, easy-to-understand ideas. With years of hands-on experience in system administration and enterprise IT operations, he’s developed a knack for offering practical tips and solutions. Richard aims to make technology more accessible and actionable. He's deeply committed to the Geek Rewind community, always ready to answer questions and engage in discussions.
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