Hi  @MundoX

Thanks for posting you question on our community it is much appreciated

To answers your question posted 

The best viable option will be to enable filtering on the list view 

Here is a K2 Help Article that explians the details on how to enable this in Smartforms 

http://help.k2.com/onlinehelp/k2smartforms/userguide/4.7/default.htm#list_view_layout.html

If this was helpfull , please can you click on the drop down and mark this as Accept the Solution

Regards

Heinrich

That is quite a lot of records. Another approach is to filter the data at SQL level (i.e. build a SQL view), you can create a SmartObject from SQL view and use it in the list view.