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For your perl test, try using.

perl -lanf, -e 'BEGIN{ $,=','} print @F[0,14];' numbers.csv >out.csv
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It may be that at least a part of the difference is the process of joining the values from the slice, before printing them. By setting $, = ',';, you acheive the same affect without forcing perl to build a single concatenation of the values before passing them to print.

I don't have a feel for how big a difference it will make, but it's worth trying.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

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In reply to Re: cut vs split (suggestions) by BrowserUk
in thread cut vs split (suggestions) by sk

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How many continents have you visited?