Videos over home sharing super slow.

Since updating to iTunes version 10.6 I can't stream movies to my apple tv or iPad, it's just too too too extremely slow.

Even low quality movies, it has to stop and buffer all the time.

I never experienced this on previous versions.

Ive watched the first 3 Harry Potter movies, but since the upgrade, I can't watch the rest.

Literally, every 5 minutes it stops and buffers for about 10 minutes.

Are there any ways to downgrade to the previous iTunes version, or to tweak the streaming settings?

Steven