Inheritance and performance in database
Paul White explains in his answer to the question below amongst other things that automatic indexed view matching won't even be considered if a low enough plan is found first.

What factors go into an Indexed View's Clustered Index being selected?

also
Consider having a look at what statistics you have in each table
and keeping them updated

and
when using indexed views WITH(NOEXPAND) query hint

From Query Hints (Transact SQL) on MSDN:


  The indexed view is not expanded only if the view is directly
  referenced in the SELECT part of the query and WITH (NOEXPAND) or WITH
  (NOEXPAND, INDEX( index_value [ ,...n ] ) ) is specified.