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the only thing that works smoothly for me is .mp4s in itunes beamer is no better than screen mirroring which is watchable but def not as smooth, hopefully the peer to peer update in the new osx fixes this

What are your system/computer specs? Sounds like you may be experiencing hardware limitations.
 
I run beamer while also doing 3d Rendering and don't have problems. I've found no format that has issues being transmitted..
 
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