“I feel the need, the need for more speed” does make sense to me.
By changing the TFTP package size between the client and the PXE server you could achieve that.
So, if you really like speed and performance you might want to read a post that could help you.
How to speed up PXE boot in WDS and SCCM
During a PXE boot, when the boot image file is being loaded in the client, it should not take any longer than a few minutes time depending on the size of the boot.wim and your network. If it seems that your PXE boot times are extremely slow, you may be able to speed up the process by increasing the TFTP block size. This article will show you how to speed up PXE boot in WDS and SCCM.
Follow the steps below to increase the TFTP block size in both a WDS and SCCM 2007 environment.
Read rest of the blog here
by Frank Trout at http://windowsdeployments.net
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Categories: MDT, OS Deployment, OSD
The Deployment Bunny 
Yes and also get yourself into a lot of trouble because of IP fragmentation… c’mon guys blocksize is not the way to improve TFTP speed.
So, what are your recommended method then?
Anyone know what happened to that site? URL has been broken for a while now. :(