We have a requirement to read a source file, and for every row, apply some transformations and write to a output file. The code is however taking a long time approximately 25 seconds for processing a 500MB file. Please suggest if we can apply some performance improvements.
use POSIX qw(strftime);
my @Fields = split(',', $line,9);
my $Y = substr $X,0,10;
my $A = strftime "%M,%Y,%m,%d,%H,%j,%W,%u,%A", gmtime $Y;
my $B = substr($A, 0, index($A, ','));
my $C = int($B/5);
my $D = int($B/15);
print DATAOUT $line,",",$Y,",",$A,",",$C,",",$D,"\n";
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