This is a very simple trick I picked up to boost PXE boot, from the distribution point complete the following
From HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SMS\DP
Add a QWORD value (for 64bit Server OS , I'm using Server 2012) and call it RamDiskTFTPBlockSize
Give it a Hexadecimal value of "4000" or a decimal value of "16384".
I wouldn't advise you go higher than this, but you can drop it if need be.
PXE boot again and you will see a increase in speed.
Enjoy
:)
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