Here it is:
method | time | units
-------------------------+---------+--------------
count(*) on acs_objects | 7.23621 | milliseconds
(1 row)
method | time | units
---------------------------+---------+--------------
count(*) on acs_objects2* | 9.97299 | milliseconds
(1 row)
method | time | units
--------------------------+---------+--------------
count(*) on acs_objects2 | 2.89982 | milliseconds
(1 row)
acspg=#
The first case is the acs classic case, and the second and third cases are with inheritance. The only difference being that I'm selecting from acs_objects* in the second case.