>perl -MTime::HiRes=time -le "$t1=time; require Carp; $t2=time; print $t2-$t1"
4.05311584472656e-006

>perl -MTime::HiRes=time -le "$t1=time; require Carp; $t2=time; print $t2-$t1"
4.05311584472656e-006

>perl -MTime::HiRes=time -le "$t1=time; require Carp; $t2=time; print $t2-$t1"
4.05311584472656e-006

>perl -MTime::HiRes=time -le "$t1=time; require Carp; $t2=time; print $t2-$t1"
5.00679016113281e-006

>perl -MTime::HiRes=time -le "$t1=time; require Carp; $t2=time; print $t2-$t1"
4.05311584472656e-006