I would guess the slowdown simply happens because of the increased disk IO due to opening and reading 85 files instead of a single file.

How large in absolute terms is the performance difference? If it really is large, maybe you need to choose a different disk layout to make loading the files faster? If your script is just running as a short-lived process, maybe you can change that to a longer-lived process by passing in more work to process in one go?

In reply to Re: Splitting large module by Corion
in thread Splitting large module by jimmygoogle

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