# CS3 Performance Concern

**URL:** <https://forum.kirupa.com/t/cs3-performance-concern/229642>\
**Category:** flash\
**Created:** [June 19, 2007, 5:45am UTC](https://forum.kirupa.com/t/cs3-performance-concern/229642 "2007-06-19T05:45:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![glidealong](https://avatars.discourse-cdn.com/v4/letter/g/da6949/32.png) [@glidealong](https://forum.kirupa.com/u/glidealong)\
**Post date:** [June 19, 2007, 5:45am UTC](https://forum.kirupa.com/t/cs3-performance-concern/229642/1 "2007-06-19T05:45:26Z")

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Hello, I just created a flash movie with around 100 instances of the same movieclip arranged across the stage. When I publish the movie and open the swf in firefox I get some annoying results. Just moving the mouse acros the stage substantially increases the CPU usage.  
I tried using mouseEnabled = false and mouseChildren = false, but that too seems to be ignored where as in flash 9 it increased the performance under similar circumstances.

Any suggestions would be greatly appreciated,

Thanks and Regards