Best practices for Flash template performance

What is the best way to handle multiple Flash templates in a single channel?
Is it better to distribute each template to a different video layer or use a single video layer with multiple Flash layers?
What is the difference between the two methods?
The Wiki just recommends using lower resolutions but doesn’t say anything about this.

If you run them on separate video layers you get sepaeare Flash player instances. As Flash player is single treaded this helps to distribute the load to different CPU cores.