[Haskell-beginners] parallel map/filter

[Marcin Mrotek]

My first guesses would be that:
a) Your program is slowed down because lines from the file is read one line
by one, i.e. there's lazy IO at work. Have you tried your code on a list
that's loaded in the memory as a whole at once?
b) The cost of dereferencing the next link in a list overwhelms the cost of
computing one answer. Have you tried using a tree instead?

Best regards,
Marcin Mrotek
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