Vaadin 7 and performance issue

I’m looking for UI for my backend application(Spring Boot) and created a POC on Vaadin 7 framework. Right now I have a questions about my POC performance -!decisions/74080/comparison-of-antivirus-software-for-windows/74092,74096
Please click on the criteria at left panel and you will see a very noticeable delay.

Could you please take a look into this example and tell me how the performance can be improved ?

I do not see any “noticeable dely”. Please elaborate where to click …

For example please visit a following url -!decisions/74080/comparison-of-antivirus-software-for-windows/74094,74097,74098,74096,74099,74095
and click on “IDS” item at the left panel(Criteria)