Have you ever been curious about performance (benchmark) tests in ActionScript 3? Here are some results gathered from gskinner blog.
Performance testing on loops (read more).
method............................................................. ms
for (var i:uint=0; i<length; i++) 40
for (var i:uint=length; i>0; i--) 40
var i:uint = 0; while (i < length) i++; 40
var i:uint = length; while (--i) 52
var i:uint = 0; do {} while (++i < length); 68
var i:uint = length-1; do {} while (i--); 68
for (var b:* in arr) 224
for each (var b:Boolean in arr) 216
for each (var b:* in arr) 200
for each (var b:* in arr) var c:Boolean = b as Boolean; 686
arr.forEach(arrForEachF) 1446
Performance testing on operations with Number, int, uint. (read more)
Assignment (a:TYPE = 0) ......... min - max (ms) int: 24 - 45 Number: 24 - 36 uint: 25 - 37
Assignment (a:TYPE = 0.5) ....... min - max (ms) int: 56 - 83 Number: 26 - 43 uint: 57 - 92
Division (a:TYPE = i/2) ......... min - max (ms) int: 60 - 105 Number: 34 - 64 uint: 184 - 278
Multiplication (a:TYPE = i*2) ... min - max (ms) int: 78 - 129 Number: 39 - 64 uint: 207 - 280
Addition (a:TYPE = i+2) ......... min - max (ms) int: 31 - 49 Number: 44 - 55 uint: 85 - 113
Bitshift (a:TYPE = i<<1) ........ min - max (ms) int: 31 - 63 Number: 61 - 114 uint: 71 - 130