[distcc] hi, help me to increase the compile speed using distcc and cygwin, thanks a lot!

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hello,everyone,dear friends,
    i want to use distcc and cygwin to increase the compile speed, i meet 
some problems:
    1) i use three pc to compile a small project,it cost 35 seconds, only 5 
seconds shorter than not use distcc in one computer
    2) i use six pc to compile a large project, i build 12 jobs, but half 
the time the 
server cant send the .c source files to others hosts, at last it cost 30 
minutes, no shorter
than not use distcc.
    3) how can i increase the distcc compile speed? it seems that the 
distcc has strongly 
relations with the network status¡£