$140(Array) twice as fast as $126(Array) ?

$140(Array) twice as fast as $126(Array) ?

I noticed this by accident (I had a bug in some speed tests)
If i give them both an array of size 1e5, the latest one is twice as
fast as 1.2.6 ?
var A[1e5], j=1e5; while(j--) A[j] = j ;
$140(A), exits (on average) twice as fast as $126(A) ...
--DBJ
PS:
$126 --- jQuery 1.2.6
$140 -- jQuery 1.4.pre