And to support your point, an invariant string inside double-quotes gets compiled down to a single quoted string. Any time wasted is not wasted at run-time.
$cat print.pl
print 'Hello';
print "Hello"; # compiles to 'Hello'
print "Hello $_";
$perl -MO=Deparse print.pl
print 'Hello';
print 'Hello';
print "Hello $_";
print.pl syntax OK
5.005_03, 5.6.1 and 5.8.4 produce identical results.
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