The screen takes several seconds to open

I have a screen within which I have a collection associated with an entity. There are 8000 records within the collection.
The Collection is associated with a suggestionField.
The screen takes several seconds to open.
What can I do to make the screen open faster?

I guess that the whole collection of your entities is being loaded. Do you have a collection loader for you instances like this?

<data>
   <collection .../>
</data>

If so, then it should not be there and the query must be defined only in the EntitySuggestionField.