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If you go with AS3 , try GreenShock. If you like buy the license. With a few sales here it’ll be worth the money. If you are in AS2 , maybe you can stay with the free Tweener. I use it a lot, quite steady, except for some filter issues, and with a lot of possibilities once you get used to it.
Apart from this, if you need to manage particles or a lot of MCs tweening at the same time, go, without doubts, with GreenSock. Look at the speed test posted above by our favorite fighter. 
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Right now Im always using caurina tweener for as2, with as3 I’ll move to tweensy or between as3 for options and performance reasons.
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Check out the speed tests: http://www.greensock.com/tweening-speed-test/^ +1 Once you’ve experienced the positive difference in a real project it’s hard to use anything else.What do you mean by that?
I don’t need those speed tests.
He talked about a “real project” .. and i wanted to see what is a “real project”. 
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+1 for greensock. TweenLite is always getting better and better and with the different flavors of tweenNano, TweenLite, and TweenMax not to mention timelinelite… i honestly don’t remeber how to code without tweenlite.
greensock all the way! hands down.
thanks guys. it seems greenstock is taking the lead
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TweenLite/Max fo sho
Check out the speed tests: http://www.greensock.com/tweening-speed-test/^ +1 Once you’ve experienced the positive difference in a real project it’s hard to use anything else.What do you mean by that?
always depends on your needs. and “real projects” come in all shapes and sizes! 
if you don’t need to move 2500 sprites at once then maybe these results don’t really matter so much! I use the easiest, cheapest approach unless I need the better performance.
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Like most of everyone I use GS
BUT if you just start to play with tweening engine, get Tweener because it’s free, easy and you don’t need those extra feature from GS yet
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I don’t need those speed tests.Check out the speed tests: http://www.greensock.com/tweening-speed-test/^ +1 Once you’ve experienced the positive difference in a real project it’s hard to use anything else.What do you mean by that?He talked about a “real project” .. and i wanted to see what is a “real project”.
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What I meant was that the speed tests are nice but if you’ve ever had a project that was a bit slow until you switched it over to Greensock you’ll alwayd want to use Greensock afterward. At least that’s what happened to me.
But in case that didn’t clarify a “real” project would be anything that isn’t a speed test 
