When to use 'runtime bitmap caching'?

As title says… when is the appropriate and most efficient way to use runtime bitmap caching.

For instance:
Say I have a circular prize wheel with text in each slice (all vector). This mc is placed on the root directory and contains only 1 frame and is animated via AS. Is this a ideal situation to turn on ‘runtime bitmap caching’?

If situation changes:
Instead of animating the wheel via AS, I instead create motion tweens inside the wheel mc. Should you still use bitmap caching on the mc? What action or properties of this mc would alter the reasoning for using bitmap caching or not using it (should i use it if the wheel animates constantly or only animates once)

Even though this is scenario based, i would like to think it would be a similar situation for if i was using a vector logo instead of the wheel mentioned above, or any other vector graphics for that matter.

on a side note: Is bitmap caching only effective for vectors or can they be used on animating and no animating imported png’s/gifs/jpgs…etc… nested in mc’s?

cheers for any helpful thoughts. :slight_smile: