# Do invisible objects slow flash down?

**URL:** https://forum.kirupa.com/t/do-invisible-objects-slow-flash-down/179065
**Category:** flash
**Created:** [February 16, 2006, 11:39am UTC](https://forum.kirupa.com/t/do-invisible-objects-slow-flash-down/179065 "2006-02-16T11:39:50Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Clark](https://avatars.discourse-cdn.com/v4/letter/c/6de8d8/32.png) [@Clark](https://forum.kirupa.com/u/Clark)
#### Post date: [February 16, 2006, 11:39am UTC](https://forum.kirupa.com/t/do-invisible-objects-slow-flash-down/179065/1 "2006-02-16T11:39:50Z")

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Ok I’ve made a big animation in flash but my rookiness has shown through and rather than using masks, I have kind of created my own by putting shapes the same as the background colour over the top of the lines I am revealing. I would convert these to masks but masks work in the opposite way (displaying what appears within the overlap, rather than hiding it like my invisible top-layer shapes). Anyway, it would be quite alot of work to completely re-do the animation but I will do it if I can get better performance. Does anyone know if all those moving shapes are slowing this animation down? I mean flash doesn’t actually have to render anything because they are the same as the bg, but I guess it doesn’t kow that, and it still has to calculate the same amount. But are masks any different?