OSD: Downloading multiple files is very slow

I has a exe software. It is not a single file package, it contains a lot of files. when I installed this software in OSD, I found it would spend 15~20minutes to download files.
It was very strange. The software is only 750 mb size. the speed of downloading 6 GB OS image is also much faster than this software.
I know downloading multiple files is slower than downloading a single file, if their size are same.
But the downloading of multiple files in OSD is "really" very slow.
Why? Cause of BITS or RDC? How to fix it?
PS：I update to SCCM 2012 R2 with CU1, add the below into SCCM
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SMS\DP]
"RamDiskTFTPBlockSize"=dword:00004000
http://windowsdeployments.net/how-to-speed-up-pxe-boot-in-wds-and-sccm/
Now, the download speed up to 4 minutes, but it still slower than the normal copy & paste.
Test result:
OSD: 2.6G
single image, 2 minutes
OSD: 750m multiple files, 4 mintues
after OSD, copy & paste from network drive, 750 multiple files, 1 mintue

I had updated to CU1 and add this into regedit . It is quicker than before, but it still slower than the normal.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SMS\DP]
"RamDiskTFTPBlockSize"=dword:00004000
http://windowsdeployments.net/how-to-speed-up-pxe-boot-in-wds-and-sccm/
Download 2.63 G OS image:
2min
Download 750 M multiple
files 4min

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