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  1. or download this
    use Benchmark qw(cmpthese);
cmpthese(10000000, {
  single => sub {$foo = 'http://www.yoursite.com'},
  double => sub {$foo = "http://www.yoursite.com"},
});
  2. or download this
                Rate double single
double 2865330/s     --    -2%
single 2915452/s     2%     --