Silverlight Peformance Tips
A great post about some Silverlight performance tips: Silverlight: A few thoughts on minimizing CPU usage:
The first two suggestions will have the most drastic improvement on the performance of your Silverlight application, and can affect CPU usage, framerate, and application responsiveness.
- IsWindowless=false is faster
- Opaque Background is faster
- Read full article...
An there is an MSDN article about Animation Performance Tips.