I would suggest you try to keep each slide to somewhere less than 3 minutes. Less than one minute is even better, though that is not always possible depending on subject matter. The problem is always going to be that the more things (objecs, actions, etc) you pack into a single slide, the more likey you will run in to problems on that slide, and the more difficult it will be to debug the issue.
Try to keep everything as simple as possible. Think about who will need to maintain the content in future. If a year or two goes by, even if YOU are the one maintaining it, you will still struggle to remember how you set everything up.
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