# Render and pre-render?

**URL:** <https://forum.kirupa.com/t/render-and-pre-render/318173>\
**Category:** Uncategorized\
**Created:** [January 12, 2011, 9:49am UTC](https://forum.kirupa.com/t/render-and-pre-render/318173 "2011-01-12T09:49:22Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![OMG](https://avatars.discourse-cdn.com/v4/letter/o/9dc877/32.png) [@OMG](https://forum.kirupa.com/u/OMG)\
**Post date:** [January 12, 2011, 9:49am UTC](https://forum.kirupa.com/t/render-and-pre-render/318173/1 "2011-01-12T09:49:22Z")

</div>

I think I got confused by these two notions… according to the flex documentation (even though I’m not using flex, bur I couldn’t find any info anywhere else), render is the when flash draws the stuff, and pre-render is when flash configures the clip before placing it on stage?

In my app there’s 300 clips constantly moving on the stage. When I check with the profiler it indicates that pre-render is using lots of resource. However when I change the clips’ visibility to false there’s almost no pre-rendering. Shouldn’t that be rendering’s job?