There's no contrail rendering yet. Although it does not sound too difficult with a single wind vector.

Is Sitrec very slow on your Mac?

It's pretty sluggish. Also sometimes I simply cannot get the camera to track the object I want it to.

On the Apple Menu, "About this Mac", what does it say for "Chip" (Or "Processor") and "Memory", and then "Graphics" (if it has one)

Here's what I have.