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rsync alternative for low cpus

I had to transfer some +500Gb of data from an NTFS drive, using my QNAP TS409 PRO Nas external USB connector.

Using the integrated “hot copy button” or a simple rsync between the two drives, i only reached 2.5mb/s which is a pitty. In fact its the Qnap Cpu which is a pitty. (yes rsync is cpu consuming)

So inspired from http://discuss.joelonsoftware.com/default.asp?design.4.528600.11 i wrote a simple bash script to recursively copy a directory tree, but using cp instead of rsync. I can now reach 6.5mb/s which is 3 times faster.

So here it is : http://www.revolunet.com/static/download/labo/mysync.sh