# Flex / Pure AS3: Components and drawing

**URL:** <https://forum.kirupa.com/t/flex-pure-as3-components-and-drawing/317522>\
**Category:** flash\
**Created:** [December 23, 2010, 11:13am UTC](https://forum.kirupa.com/t/flex-pure-as3-components-and-drawing/317522 "2010-12-23T11:13:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Nathan1](https://avatars.discourse-cdn.com/v4/letter/n/8baadc/32.png) [@Nathan1](https://forum.kirupa.com/u/Nathan1)\
**Post date:** [December 23, 2010, 11:13am UTC](https://forum.kirupa.com/t/flex-pure-as3-components-and-drawing/317522/1 "2010-12-23T11:13:08Z")

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Hi,

I have mainly been developing pure AS3 application and have recently started to explore Flex and I was wondering if I could get a few pointers on some elements:

- in terms of performance, is there a difference between using the Flash CS3 components and the Flex components. I know that the Flex components are “heavier” in terms of memory usage but what about speed? Do they perform better?
- similarly is there a performance difference in drawing using pure as3 and using mxml?

I have a pure AS3 app with some custom UI components (based on the CS3 components), I am wondering if a switch (and hence re-write) of the UI in Flex is worth it. I know it’ s quite a vague/broad question but I would appreciate some opinions.

Thanks.