I have a large background Bitmap image that I blur with a tween, and it doesn't go very smoothly on lower end computers. I've read that you can apply filters to the BitmapData instead. Would that have any effect on performance?
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I doubt it since the bitmapdata is the content of the bitmap itself. Is this a scrolling background? Maybe only draw the visible part & blur that smaller segment. Look on google how to draw a segment of a larger bitmap. By offsetting where you draw each time it gives illusion of scrolling. – VC.One May 11 '16 at 17:18
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You should create a blurred version of the image outside of the application and use that. If it has to be created by the application during runtime, create a the blurred version in a regular movieclip, draw the clip to bitmap, and delete the movieclip. I can give you the code to convert movieclip to bitmap if you want. – moot May 12 '16 at 00:45
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Are you talking about the built-in filters in de Flash IDE? (blur, glow, drop-shadow, etc). Because those are very performance-heavy, to the point of being unusable. It might help to have a blurred image in the library and tick the 'cache as bitmap' option. You can indeed also use bitmapdata and filter that with an AS3 script, that should work better. See: http://stackoverflow.com/questions/6003706/applying-blur-filter-to-bitmapdata – Kokodoko May 13 '16 at 11:41