Optimize AS3 for speed - Bitmap filters reply

I originally posted this as a reply to a comment on MichaelJamesWilliam's blog entry "Learn how to Optimize your AS3 Code". The spam catcher kept refusing to submit it (I'm guessing because of all the links), so I reposted the reply here.

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kustrle February 11, 2010 at 7:51 am

I was sure pixel perfect collision detection already first check if two objects are overlaping. Is there any way of reducing lag that comes from glow, blue, etc without photoshop? Since we lose flexibility there too. If we want to change glow to other color later it will be much harder. Can we tell flash to convert those objects to some kind of bitmap picture and then forgot about all filters? Great tutorial!

@kustrle - Yes, it is possible to save the "filtered" version of DisplayObjects as BitmapData and use that the entire time.