# EventListener and Performance

**URL:** <https://forum.kirupa.com/t/eventlistener-and-performance/243983>\
**Category:** flash\
**Created:** [November 13, 2007, 8:49am UTC](https://forum.kirupa.com/t/eventlistener-and-performance/243983 "2007-11-13T08:49:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lunetics](https://avatars.discourse-cdn.com/v4/letter/l/c2a13f/32.png) [@lunetics](https://forum.kirupa.com/u/lunetics)\
**Post date:** [November 13, 2007, 8:49am UTC](https://forum.kirupa.com/t/eventlistener-and-performance/243983/1 "2007-11-13T08:49:44Z")

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History:  
I´ve a class, in my application, that generates different layout interfaces depending on what to do. Every interface contains a number of event listeners for buttons etc. The maximum numbers of interfaces is between 4-5.

What´s better:

1. Turn on/off the different interfaces by the visible=true/false property and don´t remove any event listers.

2. Turn off the different interfaces using removeChild() and then remove all listeners. When turning on you creates the interfaces again.

_Every event listener use memory but creating the interface everytime also have some affects (/CPU)._