var zil = [];
for (i=0; i < 10000; ++i) zil[i] = i+3; 
var s = 0.
for (j=0; j < 1000; ++j)
for (i=0; i < 10000; ++i) s += zil[i];
document.writeln(s+",");

On a 1.83GHz core duo Intel.

1.3 sec	Webkit 71897 or Safari 5.0.2	130 ns per iteration.
0.11 sec	Chrome 7	11 ns per iteration
0.30 sec	Firefox 3.6	30 ns per iteration

This Java code does this in 33 ns per iteration.
This C code does 10 times as much at 1.9 ns per iteration.
This OCaml code does this in 9.4 ns per iteration.