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I downloaded the trailer and ran it in Quicktime and VLC. VLC? No problems. Quicktime Player 7? Stuttering and freezing. Quicktime Player (Mavericks)? Perfectly fine. My specs of my iMac are in my signature.



EDIT - Edited because I forgot to post the Quicktime Mavericks bit!
 
Ran fine on my iMac. downloaded it and played it in quicktime.

Late 2013 27" 3.2 i5, 8GB Ram, GT 755M, OS X 10.9.4

said quicktime was using 3% CPU in activity monitor.
 
I tried running the file on my macbook air. 1.3 ghz 4 gb of ram. ran it full screen with no issues or stuttering. the fan didnt even come on that i could hear. I used quicktime.
 
2013 iMac 27"
3.4ghz i5
775m
24gb RAM
OSX 10.9.4

I'm downloading the file now so I'll edit this in a little bit or later tonight (slow download).

However just clicking it in Safari (Elysium 4k trailer) it played smoothly except it was pausing due to the slow download speed.

EDIT: Played perfectly in quicktime. User + System CPU never used more then 9% combined.
 
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