Title Pop Up window slow movement

Question

Hello flexers,

I have a big flex app with several elements laying out (see http://www.edoboard.com)

When i create Popup of TileWindow with PopUpManager they show up well but are slooww when dragged around. Even slower in the version i am working on.

Do you have any idea why is it slow ?

Even on simple examples http://blog.flexmonkeypatches.com/tag/popup/

How could i improve it or use an other trick with the same effect ?

Like a canvas listening for mouse up/down/move and moving by itself ?

Thanks !