Currently i am using HBox as Container for my Custom Itemrenderer , but due to its layout issues , i want it to change the Container from HBox to Panel .
But i am also worried about the performance , how can i make sure that changng containers didn't affected or affected performance of an Application ?? .
You can run your project using "profile" to verify the performance of each instance in your application.
If you really wanna improve the performace, use Canvas instead.
Take a look in this link to know how to use it:
Hope it helps you!