Leokan, You should set the framerate to 60.
I think it is worth trying useVirtualLayout=false especially if the current item renderers uses large images. Once all the items renderers are initialized, they won't be rendered anymore. (this setting "works" only if the list contains a small amount of item renderers, otherwise initialization duration and memory consumption would be too important) Vincent. -- Sent from: http://apache-flex-users.2333346.n4.nabble.com/