Flex AIR SwfLoader CPU Usage > 50% problem

I have an AIR application, I use SwfLoader to load another swf file to display in this app. The problem is the CPU Usage always takes over 50%, but it only takes 15% when the swf file runs in standalone mode.

Does anyone meet this issue? Please give me some ad开发者_开发知识库vices. Thanks a lot

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WOW, you were so right. Thank you binhdocco for posting your solution! It just solved a major issue at my job.

Adobe, This is a horrible bug! Why even have the window.transparent property if its going to run at 50% CPU on Windows?!?! #FAIL