Tweaking PXE boot times in Configuration Manager version

Tweaking PXE boot times in Configuration Manager version In Configuration Manager we have option to tweak our PXE boot times, TFTPWindowsSize which we can change in the registry on our PXE enabled DP’s.

This is new version for SCCM TFTP Changer. What’s new:

  • New button Remove keys;
  • Nulled items don’t work, you must choose from drop-downlist for both parameters.

PXE booting a machine can never be fast enough!

Name: RamDiskTFTPWindowSize

The default value is 1 (1 data block fills the window)

We can also tweak the TFTPBlockSize which has been around for many versions of Configuration Manager.

Name: RamDiskTFTPBlockSize
Value: <customized block size>

The default value is 4096 (4k).

Put together this list that could be a good starting point when testing out the different TFTP:

Conclusion UEFI boot is slower! and the values used will be different for many customers as there are now optimal values that will be best in all environments.

PowerShell code from

I’m recreate this tool from powershell to app.

P.S. Run as administrator


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