fast camera animation
 

Hello,
today i found out how hard it is to animate a camera like a flying cam over a terrain with mountains for example.
especially when the terrain is polygon heavy.
the preview possibility becomes really slow and making test renders is also not quick.
is there anybody who has heard of a good tutorial about camera animation, especially fast moving cams in delecate surroundings??????
Where are the starwars fans to teach me?
thanks Nathan