The json fixture we use  contains creation of objects that we only rarely use. We should remove as much as we possibly can from this file.  https://github.com/mozilla/airmozilla/blob/master/airmozilla/manage/tests/main_testdata.json
It might be worth putting some of the fixtures into setUp() methods too.
Commit pushed to master at https://github.com/mozilla/airmozilla https://github.com/mozilla/airmozilla/commit/4aa24dac7ce92013ec962871b95a73219857b419 fixes bug 1126528 - Minimize use of JSON fixture
I measured every single SQL query that was sent to PG during the full test. I filtered it by all INSERTS. Before this work, there was 9071 inserts. After, only 6357