For a game I'm making with AS3 I've tried to stick with using flat arrays as much as possible because I read somewhere that its faster than using multidimensional arrays. I just need to know if anyone knows or can point me to any place which discusses the speed difference (if there is any).

Using multidimensional arrays would make my coding much easier but if its slower than flat arrays I'm willing to persevere for the better execution time.

Any thoughts?