Recommended Movie Sizes for Keynote

Can someone tell me the best way to compress a movie, step by step in Quicktime, so that the movies will play smoothly in Keynote? I think I'm placing movies that are too large, and consequently, they are playing with a jerky motion, skipping frames, from within Keynote.
I made the movie sequences in Final Cut Pro, and exported from there to movies (.mov) with an 800 x 600 size. But I don't understand resolution issues, or bit rates, or any of those other details, that might make the movie play more smoothly while retaining a clear, clean look, when projected.
My movie sequences in Keynote are anywhere from 1-10 minutes in length, and the size of the movies are anywhere between 200 mB to almost 1 Gig.
Any ideas?
Uri

I regularly incorporate videos into my presentations. I encode them using h.264, and save them as MP4 files. I specify an average bitrate around 1200. I also do not embed the files into Keynote.
One thing I noticed: If I have the ethernet connection plugged in, I get stuttering video, but if it's unplugged, it generally works better. I have no idea why.

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