Optimizing Sluggish UI

Hi,

I’m new to Vaadin, and i’m working on the optimisation and the amelioration of our company application (it’s a huge vaadin 6 software).

Our client is complaining about the slugglish application when using IE11. So from your following article
https://vaadin.com/wiki/-/wiki/Main/Optimizing%20Sluggish%20UI
:

I’m using customLayout instead of panels. So if i put a Layout : vertical or horizontal layout in a customLayout is it better than putting them in a panel?
What is the best way of using the CustomLayout API to optimize the different UI?

Kind regards,
Amira