Faster read performance DURING (?) resync on raid10

I have done some automated scripted tests with bonnie++ over RAID10 and
encryption, using different encryption cipher modes to evaluate the impact
on I/O operations.
The strange thing is that I can see a significant increase in read
performance (about 20%) when running the tests DURING the raid resync phase
directly after the raid creation as appose to running it after the resync,
or after I create the array with --assume-clean (which skips initial
resync).

Have anyone noticed the same behaviour, and how can it be explained? Any
ideas?

Can someone else verify that they get the same result?


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