The current behavior of the filters in the query builder when opening a query or draging in a new filter is that all distinct values of the filter are queried automatically. When doing this on large data tables, that slows your work down significantly while you are waiting for the filter queries to finish.
I would like the possibility to tell the query builder to only start those distinct values queries manually and when I decide to, e.g., only after I have finished tweaking around with my filters or if I want to use this special filter.