Performance question with a string concat

Hello,
I want to let grow a string variable within a loop.
A non-interpolated string '' is said to be faster than the usual "" string.
Disadvantage of the non-interpolated string is that \n is not recognized.

Now, what would be faster?

a.)
my $out;
for (my $c = 0; c < 100; c++)
{
   $out .= "variable=\"value\" \n";
}

oder b.)
my $out;
for (my $c = 0; c < 100; c++)
{
   $out .= 'variable="value"' . "\n";
}




And what if interpolation is needed?

c.)
my $out;
for (my $c = 0; c < 100; c++)
{
   $out .= "variable=\"$value\" \n";
}

oder d.)
my $out;
for (my $c = 0; c < 100; c++)
{
   $out .= 'variable=" . $value . '"' . "\n";
}


Thanks a lot.


--
   Viele Grüße || Greetings || Saludos,
   Simon von Janowsky.
.

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