I decided to push the bounds of Unitys engine by spawning mass objects of my head. Amazingly hardly any performance issues at all! Even with so many objects interacting. It's hugely better then Flash. I made a video of it and uploaded so you can see the mass Bradley heads all interacting with each other and bouncing off each other! It's pretty cool. I'm very impressed with the Unity engine being able to handle it, however I guess since Unity is meant for 3D it won't have much problem with lag.
However I did run into lag when I was making huge sprite backgrounds, which is ironically strange because I didn't think that would be a big deal.
You can view the funny video of mass heads below on youtube as shown in the picture below >