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I'd assume that the bottle neck would be I/O if these images are ~30mb as the OP stated in the thread. I don't think you'd see 4x speedups from parallelizing.

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Good point. All the more reason to actually measure and find the bottleneck.

Would faster disks / SSD's help in this case?

Not if the data has to be read from the slow disks to get it onto the fast ones.

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