> I’ve created several nestable projects (working with stills).
How big are the stills? What are the dimensions of your project. The stills should be no more than 2x the project dimensions. If you are not zooming, you can even make them match the project dimensions, especially if it’s an HD project. Using multi-megabyte stills is not recommended.
> Each may have 2 to 5 tracks, some with 3D Alpha Track Motion.
3D Track Motion is very processor intensive all on it’s own. Add to that the fact that still images are being resized at the rate of 30fps and you are almost guaranteed stuttering preview.
> I tried playing around with the Preview Max value. The window itself is set to Preview(Auto) because I thought I read in the manual that’s a good value to use.
Yes, but sometimes you need to go down to Draft (Auto) mode depending how the demands of the project and power of the CPU.
> I’ve been playing with these values, 128 to 768MB, Preview(…) and can’t seem to get the Preview window to be more … “smooth” (for lack of a better term).
You’re confusing the Preview setting with the Dynamic RAM Preview setting which are two different things. Changing the MB will not affect the preview window at all. This is only for RAM preview which is invoked by making a timeline selection and pressing Shift+B. This dynamically renders the timeline selection to RAM for guaranteed smooth playback. The amount of RAM you use for this determines how large a timeline selection you can make.
~jr
http://www.johnrofrano.com
http://www.vasst.com