array.forEach running faster than native iteration? How?

Question

http://jsperf.com/testing-foreach-vs-for-loop

It was my understanding that Test Case 2 should run more slowly than Test Case 1 -- I wanted to see how much more slowly. I

Answer 1

Reading length from array at each iteration may be slow, but forEach is comomonly slower, cause function call isn't cheap operation in js.

PS: forEach is 14% slower on FF10.