How to use Combobox?

Hi! i'm working on the sample project using the Combobox component.

After input a lot of data into combobox.
The slowed situation happens, when scrolling combobox items.

so, i was searching some solutions which to resolve this problem,
and i found some answers that is lazy loading.

when lazy loading, 
this slowed situation happends.
It is difficult for me to use  vaddin.

I want to quickly handling the bulk data.
Is there any method that does not use lazy loading?

How can I solve this problem?

:( please...help me.....