Embedded QT movies are choppy in KN3 - help?

I have Keynote 3 and am using the same presentations I have used in the prior version. I have small quicktime movies I use in class that came with the text or ancillary CD's that are placed on the slides. During the show the movies playback very choppy when projected to the screen through a LCD projector.
When I play them on my Powerbook without projecting them they play fine in the presenation. I am lost as to why this is happening or what to do to get smooth playback of these movies while running the presentation. Since I am using dual display mode and different resolutions it is very difficult to switch out of Keynote to find and play them individually in the Quicktime Player. The whole purpose of Keynote is to do the presenation and move from slide to slide without having to switch between apps to do video.
I would appreciate any help with this as the class is running now and I have this need every day. Thank you.

I too am disappointed with KN's handling of QT movs. I'm seeing an issue wherein keynote appears to display a half-resolution proxy of the first frame of the mov during the dissolve transition. The presentation then "pops" to the actual QT mov, a 1024 x 768 DVCPro HD codec mov. The mov is gorgeous in QT Player, but this "pop" effect is not acceptable. Also puzzling is that this doesn't happen to a monochrome QT mov which uses the same codec.
I've tried using QT Pro to set the movs to "Preload this Track" but that doesn't seem to affect KN's handling of the transition and/or the QT mov. I don't know if the setting is irrelevant to KN because running in dual display mode means I cannot see Activity Monitor to watch for RAM usage spiking as that page loads, etc. And really, isn't this sort of testing Apple's job anyway?
That said; suppose mirroring resolves the playback issue. It's still broken. When using Presenter Display the user should be able to assign display resources as she sees fit; I'd be delighted to view a black and white, lower res Presenter Display if that would help ensure that the audience got the experience that I intended and programmed.
The other thing is that mirroring itself is broken to my mind. When I mirror my display, I still need each to use appropriate calibration settings. I want to "mirror", not "mirror and apply identical calibration settings" to the two displays. Especially with a PB; where am I going to find a 1440 by 960 projector with exactly the same colorimetry as this display I'm typing on now.

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Thank you for your reply, Kirk,
1)Yes, I do have "fast start" enabled in my files, and they were made with QT Pro, newest version. So no, there is no "trouble with my files".
However, I would still like to have that flashing "Loading" icon when the file is loading, as I see on other sites. (And yes, even with "Fast Start" enabled, depending on the size of the file, the speed of the computer and internet connection, it can take a little time beforeit starts.) Anyone know how to create that flashing "Loading" icon, rather than just the static Q?
2)I just wondered if there was a way for the javascript to recognize if the user does not have javascript, and bring up a message if that is the case, telling the user they need to enable it to see the content. (As would happen if the user does not have the QT plugin installed.) Yes, I realize it would not work to include in the normal way the embed and object tags as well, I wondered if there was a way to invoke them only if the user doesn't have javascript. Perhaps impossible, but I thought I'd ask, in case someone knows of a way to do that.
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