I notice that DefaultCacheStrategy in grid is not configurable in server side at all.
As a workaround there is addon including client cache fine tuning available
https://vaadin.com/directory#!addon/gridextensionpack-add-on
Question is why DefaultCacheStategy min/max in not made configurable by default?
Sometimes if backend Container is “heavy” 3-4 times(before/after) more than visible data is quite lot
https://vaadin.com/api/7.6.7/com/vaadin/client/data/CacheStrategy.DefaultCacheStrategy.html