ARD 3.3 slow when sharing screen with 30 computers

I have a lab of 30 Mac Pros running 10.5.8. When I connect wirelessly at 300mbps (n), it takes almost 30 seconds for the refresh to begin and it seems to be updating about 0.5 fps. It seems that RD does not "broadcast" the image, rather it sends each workstation the screen refresh.
Is this the expected behavior? Are there other, faster solutions for Mac Labs out there that take over the workstation and display the instructors workstation screen?
I have tried the wired connection, it seems to run about 2x faster, but this solution is not feasible for my setup.
Any help is much appreciated...

They both use VNC, so keep Remote Management on and ignore Screen Sharing and leave it off. It will still function with RM turned on.

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<Edited by Moderator>

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ARD 3.3 slow when sharing screen with 30 computers

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