and what image size are your movies?
And what codec?

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no i dont think its bad.

there were no changes that would affect performance...

you are doing more than your macbook can handle.
it doesnt have great graphics performance.

catalyst is designed to work on desktop machines with powerful graphics cards.

if running on powerbooks/macbooks/mac mini- you have to work within the limits of those machines.

i think you are just completely overloading your macbook.....
syncing 3 movies on your macbook just is not going to work.
the less powerful your machine - the more conservatively you have to use it.
There is no magic.