> if it is possible to change the  transfer size 128 KB when compiling IM.

The disk transfer size is typically defined by the width of the image
since most algorithms read or write a single scanline of the image at
a time.  Possible paths to improve speed is to force the pixel cache to
memory (add -limit area 4096 -limit memory 4096 to your command line) 
or use locally attached Raid 0 15K SAS disks.  If all else fails use a 
different image processing program such as vip or sip.

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