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To PACK and read or not?

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I have a section of my code where the main bottleneck is non-contiguous reads. So one option is for me to PACK it and then read it. Also, packing it gives some other benefits where I can use modules I already wrote. I can not yet test this out very well because I will need to scale my system a bit to see appreciable effects, and there are other problems to that right now.

So my question is, Is the packing operation equivalent to moving between non-contiguous sections of an array?

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