Zooming / scaling of mc slows down the movie

What is the best way to zoom a movie clip, so that at the end it would be something like 10 times bigger? If I do this on the timeline, it will slow down the show dramatically.

I know the change is huge and I have several clips inside it, so it is really heavy. But I assume usign zoom just for one instance is not so heavy as scaling/zooming all separately would be?

So what solutions can I try to get smooth movieclip scaling / zooming.