A couple months ago I Was watching AE tutorials On YouTube, and came across one where the instructor demonstrated how to RAM Preview certain areas of the timeline, and at the time I did not need that information. Now I do and I cant find the video, nor do I remember how do it, please somebody help me!
Simple: you limit the Work Area.
Put your timeline cursor where you want the preview to start. Hit the b (for Begin) key. Notice how the Work Area marker jumps to that point.
Put your timeline cursor where you want the preview to stop. Hit the n (for eNd) key. The marker for the end of the Work Area jumps to that point.
You can move the Work Area markers around by the click-drag technique, too. Don't forget to put them back when you're done.