Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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I have the DSM-G600 and my up and dl speed is like max 1000 kB/sec. What can I do to get it faster? The network it self, the disc inside and everything else is in perfect condition. I have read this thread (http://dns323.kood.org/forum/t909-slow%3F.html) and they think that their speed at 4000kB/sec is slow, and normally gets like 15000kB/sec.
(Yes, I know the difference between kb/kB/MB etc.)
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Thread you pointed out is about DNS-323, but you got DSM-G600.There are many reasons why it can be slow. Best way to test things out is to reformat the drive, copy some big (>1GB) files to disk using ftp and samba. It there files is still copied and read very slowly, then you can install telnet and look DSM-G600 load and maybe run hdparm -tT /dev/sda
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