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The RamDisk TFTP block and window size customizations allow you to optimize TFTP traffic when using PXE to meet your specific network requirements. If you’ve customized your network, a large block or window size could cause the boot image download to fail with a time-out error. You can customize the RamDisk TFTP block and window sizes for PXE-enabled distribution points. Customize the RamDisk TFTP block and window sizes on PXE-enabled distribution points
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In Configuration Manager we got the option to tweak our PXE boot times, TFTPWindowsSize which we can change in the registry on our PXE enabled DP’s.
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Customize RamDisk TFTP Block and Window Sizes for PXE Boot in SCCM.
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