Why is i=i+1 faster than i++?

Question

Test this code in Flash:

var i:int = 0;
for (var j:int = 0; j < 5000000; j++)
{
    i=i+1;
}// use about 300ms.

i = 0;
for (var j:int = 0; j < 5000000         


        

Answer 1

++ and -- operators were designed to resemble the assembly code for increment and decrement, but nowadays it shouldn't make much difference with advancement of compilers. See section increase and decrease

It could be a change in implementation or a temporary regression in actionscript virtual machine.