The slowdowns are normal in this game... read this review.
http://www.gamespot.com/ds/strategy/ageofe...ngs/review.html
You will see it 2/3 of the page down
The part where the review says something about the screen getting cluttered isn't what I'm talking about. There's slowdown/audio glitches in the menus, pre-game 'cut scenes', ismetric movement parts, and definately in the battle scenes.
I've seen it run on my mate's SC SD and its fine. So gutted.