Vaadin 8 - Slowness


I have a Vaadin 8 Web Application running on Jetty.
My app sends a couple of pushes during its execution in order to provide details concerning the operation( a pair of strings to textfields ).

At the beginning everything runs pretty fast. However, during the execution, I have noticed some problems in attempts to scroll down or even to try to click some buttons on the interface. It occurs after hundreds of pushes…

Any comments on this ?

Thanks in advance,