Software :: Swapping Delays?

When running large keynote files (with some embedded videos) my Keynote pauses sometimes for 30 seconds or so to swap. I figured I'd just add memory, but now I have 2gig and the Activity Monitor shows that keynote is only using about 200 meg. The keynote data file is about one gig, so there is plenty of room to move it all in before I start my presentation. Any way I can make keynote run load all at once and run directly from memory? Obviously it works better for me if all the delay is at startup time when my audience is still out of the room .