"... roughly 'only' 2.5x faster ..."

Interestingly, if you look at the benchmark timings in the perlperf page: 

$ perl -E 'say 2040816.33/840336.13'
2.42857144557143

[download]

But don't read too much into that: I consider it more of a curiosity than anything else.

"... anything that results in that big of a difference is worth understanding better ..."

Someone else may have a much better answer regarding the inner workings of these. My understanding is that the SEARCH part of y///, e.g. the 'w' in 

$ perl -E 'say "xwz" =~ y/w/y/r'
xyz

[download]

is handled at compile time; whereas the equivalent part of s///, e.g. the 'w' in 

$ perl -E 'say "xwz" =~ s/w/y/r'
xyz

[download]

is handled at runtime. I couldn't tell you exactly what "handled" equates to; maybe another monk can chime in with a more complete answer.

— Ken

In reply to Re^3: 4x faster now! by kcott
in thread Syntax Perl Version support $c = () = $a =~ /\./g by h2

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.