how to make Light weight Vaadin application?

Our application is in Production environment created in Vaadin. i have done UI debugging using the given in the Vaadin site.

How to make light weight in browser?

For optimization of UI, see
http://vaadin.com/wiki/-/wiki/Main/Optimizing%20Sluggish%20UI
.

Also consider compiling a custom widget set that only contains the widgets you use in your application. This can get your (compressed) JS size down to 70-80k.