Whole code looks like
while ($string=~m{<(ths|193)>|\.}g) {
            $count=$count+($tbsz * 0.25);
        }

[download]
That makes a tr/// solution a non-candidate, doesn't it?

I'd probably go for something like: 

my %factor;
$factor{ths} = $factor{193} = 0.25;
$factor{ems} = $factor{194} = 0.5;
$factor{ens} = $factor{195} = 1;
$factor{W} = $factor{' '} = $factor{"\n"} = $factor{"\t"} = ... = 1;
$factor{w} = $factor{'('} = $factor{')'} = 0.84375;
....
my $count;
while (/(?|<([A-Za-z0-9]+)>|(.))/g) {
    no warnings 'uninitialized';
    $count += $factor{$1};
}
$count *= $tbsz;

[download]
You may want to consider replacing the (.) with ($charclass), where: 
my $charclass = join "", grep {1 == length} keys %factor;

[download]
Whether that makes a difference depends on your data set.

In reply to Re^3: Which is more faster? While or tr/// by JavaFan
in thread Which is more faster? While or tr/// by tej

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.