Rotate by script or rotated image

Dear All,

This is a simple question. I am learning AS3 and I started by trying to do a tile game. In the process, I wondered if it is faster to tell flash to rotate a tile to be reused or add a rotated image of the title. I know if I add more tiles memory will be affected but I do not know how performance will be affected when the image rotates by script.

What approach is better?

Thanks in advance