# Blurred Mask and Bitmap Caching Problems

**URL:** <https://forum.kirupa.com/t/blurred-mask-and-bitmap-caching-problems/302784>\
**Category:** flash\
**Created:** [January 7, 2010, 1:58pm UTC](https://forum.kirupa.com/t/blurred-mask-and-bitmap-caching-problems/302784 "2010-01-07T13:58:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Corvyday](https://avatars.discourse-cdn.com/v4/letter/c/c6cbf5/32.png) [@Corvyday](https://forum.kirupa.com/u/Corvyday)\
**Post date:** [January 7, 2010, 1:58pm UTC](https://forum.kirupa.com/t/blurred-mask-and-bitmap-caching-problems/302784/1 "2010-01-07T13:58:02Z")

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Hi,

I want to mask a large movieclip with several smaller movieclips. I also want to blur these masks at the edges. What I have done so far:

- Set the masked mc to bitmap caching
- Put the mask mcs into a large master mask mc and bitmap cache that too
- Apply a blur filter to the master mask mc

It all works fine BUT the problem is that the masked mc has a lot of things going on. In fact, 80% of the game I’m coding takes place in the masked mc. There’s a huge apparent lag because it’s set to cache as bitmap, which is fast for only static objects that change positions only, not content.

I’ve tried another solution where I draw outlines around the smaller mask mcs and blur the lines instead, creating a pseudo blur effect. But it’s not as good. Kinda of ugly in fact.

Is there a work around for this?