Interactive Report - How does it build the where claue when filtering data?

I am curious how APEX builds the where clause when users add filters or does APEX simply filter the data?
The reason I am asking, is for performance reasons, we have used inner selects to retrieve columns vs. using outer joins. However, I am just curious if we will suffer doing so when users add filters on these columns.
Below are some details about our report:
We have a report where we are joining many tables (25 tables) together. Initially, we created the report with outer joins and noticed that the cost of the explain plan was 2600 and the performance was marginal. We then started to remove the outer joins and replacing with inner selects and the cost and performance of the report improved. Currently, we have replaced 13 of the outer joins with inner selects and the cost is down to 650 and the performance is better.
Below are examples:
-- Using Outer Joins
Select q.quote_id, q.quote_name, l.location_name, sr.sales_rep_name
from quote q, location l, sales_rep sr
where q.location_id = l.loation_id
and q.sales_rep_id = sr.sales_rep_id
-- Using Inner Selects
Select q.quote_id, q.quote_name,
(select location_name from location where location_id = q.location_id) location_name,
(select sales_rep_name from sales_rep where sales_rep_id = q.sales_rep_id) sales_rep_name
from quote q
Just curious,
Thanks,
Brian

Hi -
If you switch on debug in Apex developer toolbar you can see the effect of user built filters on the sql that is actually executed for report.
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