# Experiencing slowdown when I move the mouse

**URL:** <https://forum.kirupa.com/t/experiencing-slowdown-when-i-move-the-mouse/294266>\
**Category:** Uncategorized\
**Created:** [August 11, 2009, 4:51pm UTC](https://forum.kirupa.com/t/experiencing-slowdown-when-i-move-the-mouse/294266 "2009-08-11T16:51:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zachwlewis](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/zachwlewis/32/350_2.png) [@zachwlewis](https://forum.kirupa.com/u/zachwlewis)\
**Post date:** [August 11, 2009, 4:51pm UTC](https://forum.kirupa.com/t/experiencing-slowdown-when-i-move-the-mouse/294266/1 "2009-08-11T16:51:04Z")

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I am working on some particle effects, and I am experiencing noticeable slowdown anytime I move the mouse. I am not using any MouseEvents, and I even see this slowdown when the mouse is moving outside of the Flash window. Also, I only notice this slowdown when running the movie from within Flash CS3 (when I run the .swf externally, it runs flawlessly).

How can I make this slowdown disappear?