Quote Originally Posted by Kianis
This is killing me, I have no idea what's causing this.
Maybe scrolling the bitmap causes the slowdown? In my scrolling engine i keep the tilemap in a single bitmap which is one tile larger than the screen and move the container movieclip instead of using the scrolling function. You may want to check this method.

Also on timing issues, Flash doesn't seem to like anything faster than 30Hz. I had big problems with 60Hz (without using much CPU time) and since 30Hz are too choppy for my taste, i settled for 45Hz. Not the most stable animation-wise, but it is hardly noticeable. What is your FPS setting?

As a side note, the game is very laggy when the SitePal banner is loaded in another tab. Maybe this is the cause?