Time to run against a 200 MB file. That is the OP's input file and appending the same 884,873 times to make a 200 MB file.

serial: 12.557 seconds

slurped: 1.644 seconds 7.6 x

parallel: 0.531 seconds 23.6 x

In reply to Re^3: script optmization by Anonymous Monk
in thread script optmization by shoura

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