In general closures have a lot higher overhead. Instead of storing a scalar variable as a hash entry, you are storing a reference to a CV structure, which points to a pad list which points to a padname list (containing the name of the lexical), and a pad containing a pointer to the lexicial plus pointers to other pad targets if there are any ops in the sub.

goto &f has roughly the same overhead as a normal exit from a sub followed by a call to another sub; ie the following two are roughly equivalent performance-wise: 

sub f { ...; goto &g } sub g { ...} f();
sub f { ...;         } sub g { ...} f(); g();

[download]

In reply to Re: Functional Inside Out Closure Objects by dave_the_m
in thread Functional Inside Out Closure Objects by fletcher_the_dog

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.