In your code above, why do you freeze the panes for every cell write? (Or at all?)

I was wondering the same. I do see value in $worksheet->set_column ($col, $col, $width); after the conversion.

Text::CSV and it's siblings may be faster at splitting lines.

unlikely, unless the code has embedded specials. I tested with a biggish CSV file with 6 fields:

$ cat data.pl
use 5.18.2;
use warnings;
use Benchmark qw( cmpthese );
use Text::CSV_PP;
use Text::CSV_XS;

my ($fh, $csv);
sub fh  { open $fh, "<", "data.csv"; }
sub cxs { $csv = Text::CSV_XS->new ({ binary => 1, sep_char => "|" }) 
+}
sub cpp { $csv = Text::CSV_PP->new ({ binary => 1, sep_char => "|" }) 
+}

cmpthese (4, {
    perl => sub { fh;      while (my @row = split /\|/ => <$fh>) {} },
    c_xs => sub { fh; cxs; while (my $row = $csv->getline ($fh)) {} },
    c_pp => sub { fh; cpp; while (my $row = $csv->getline ($fh)) {} },
    cbxs => sub { fh; cxs; $csv->bind_columns (\my($a,$b,$c,$d,$e,$f))
+;
                           while (          $csv->getline ($fh)) {} },
    });
$ perl data.pl
Use of uninitialized value in split at data.pl line 15, <$fh> line 260
+0000.
Use of uninitialized value in split at data.pl line 15, <$fh> line 280
+0000.
Use of uninitialized value in split at data.pl line 15, <$fh> line 300
+0000.
Use of uninitialized value in split at data.pl line 15, <$fh> line 320
+0000.
           Rate  c_pp  c_xs  cbxs  perl
c_pp 8.87e-02/s    --  -95%  -96%  -98%
c_xs     1.85/s 1988%    --  -25%  -65%
cbxs     2.45/s 2667%   33%    --  -53%
perl     5.26/s 5834%  184%  114%    --
[download]

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