# scrollRect efficiency

**URL:** <https://forum.kirupa.com/t/scrollrect-efficiency/307118>\
**Category:** flash\
**Created:** [March 28, 2010, 8:56pm UTC](https://forum.kirupa.com/t/scrollrect-efficiency/307118 "2010-03-28T20:56:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tbo](https://avatars.discourse-cdn.com/v4/letter/t/7feea3/32.png) [@tbo](https://forum.kirupa.com/u/tbo)\
**Post date:** [March 28, 2010, 8:56pm UTC](https://forum.kirupa.com/t/scrollrect-efficiency/307118/1 "2010-03-28T20:56:22Z")

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I recently learned about scrollRect. Can anyone tell me how efficient it is? by this i mean i have a huge background\_mc and use a stage sized rectangle as the scrollRect to scan the insides of that movie Clip. (like a vcam i guess). Since it only renders the rectangle area , is it safe to say it doesn’t matter how large “background\_mc” is ? or is it better to dynamically add portions to the background when its just outside the stage.

Thanks