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             s/iter         join          dot interpolate1 interpolate
+2
join           2.22           --         -24%         -25%         -32
+%
dot            1.69          31%           --          -1%         -11
+%
interpolate1   1.67          33%           1%           --         -10
+%
interpolate2   1.50          48%          13%          12%           -
+-

use strict;
use warnings;
...
        $string = join('', $var1, $var2, $var3) for (0 .. 10000000);
    },  
});