Most of the right checks that has to be performed are kept in the lowest level, the SQL scripts. This brings a enormous performance boost, cause there are only a few checks to be performed within the PHP Code.
There are right checks in the following SQL Files:
For each of these files, there is a file without the right checks (which will only be used for the SuperUser) called {filename}_no_rights.sql.
Here {filename} must be replaced by the original Filename without extension, for example:
item_count_all.sql ⇒ item_count_all_no_rights.sql