Working with green screen in FCP

Any clue why I'm having so much trouble? I'm trying to key out green screen in more than one layer.
I shot HD footage at 1080i30p. I have live characters on green screen layered over still psd backdrops.
Seems simple but the process seems extra slow and very glitchy.
One or two keyed layers sort of works, more than that is slow as mud or causes crashes.
Sometimes even one layer over a still backdrop will show a smear streaking defect.
Any help doing this type of compositing without having to learn Shake or After effects?

Keep in mind that the most important part of keying happens in production. If the lighting is not perfect, meaning none of the key light should spill onto the green screen, and the proportions of light from foreground to background, and the evenness of the background light: keying will be difficult.
To help yourself out, use garbage mattes to crop out any area that does not have action in it. That way you won't have to worry about pulling a perfect key for areas of your footage that don't matter. Only be concerned with the pixels just around your subject(s). You will not be able to do this well in FCP> Remember that FCP is an editing system, not compositing. Just because it CAN composite, doesn't mean that it SHOULD composite.
In Motion you can keyframe infinite points to your masks and you can use trackers to follow your subject(s) so you don't have to set manual keyframes.
I am sure you were looking for an easy answer, but unfortunately keying and copositing are not easy tasks.
Hope this helps.

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