As it currently is, you are doing 18k open+close per file. Open and close are slow on Windows. With my approach, you will reduce the number of open+close. If you process more than one file before writing the output, you can reduce the number of open+close per client even more.

Perl has no limit for the array size other than available memory.

In reply to Re^3: Delay when write to large number of file by Corion
in thread best way to fast write to large number of files by Hosen1989

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