I have not really understood your code, but sometimes it helps a lot to work with call by references instead of call by value.
Call by value will mean one additional copy of your data will be done when a function is called.
Given your amount of data this can speed things up big time.

In reply to Re^3: How to speed up/multi thread extract from txt files? by weismat
in thread How to speed up/multi thread extract from txt files? by MelaOS

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