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1-10, 500x:  2 secs ( 1.13 usr  0.00 sys =  1.13 cpu) (printing)
1-10, 500x:  1 secs ( 0.48 usr  0.00 sys =  0.48 cpu) (not printing)
1-35m  10x: 26 secs (26.53 usr  0.00 sys = 26.53 cpu) (printing)
1-35,  10x: 15 secs (15.05 usr  0.00 sys = 15.05 cpu) (not printing)

$x = 1;
for(1..10){
        $x =~ s/((.)\2*)/length($1).$2/ge;
        #print "@{[split//,$x]}\n";
    }