django sqlite Creating test database for alias 'default'

I read Q&A why django create test database, but there is no answer on a question.

I have django 1.8.4 version.

My settings.py

if 'test' in sys.argv or 'test_coverage' in sys.argv:
    DATABASES['default']['ENGINE'] = 'django.db.backends.sqlite3'

Run

time ./manage.py test 

Raven is not configured (logging is disabled). Please see the documentation for more information.
/Users/ioganegambaputi/work/foobd/foobd/core/forms.py:7: RemovedInDjango19Warning: The django.forms.util module has been renamed. Use django.forms.utils instead.
  from django.forms.util import ErrorList

/Users/ioganegambaputi/work/env/foobd/lib/python2.7/site-packages/templated_email/__init__.py:2: RemovedInDjango19Warning: django.utils.importlib will be removed in Django 1.9.
  from django.utils.importlib import import_module

/Users/ioganegambaputi/work/foobd/foobd/core/utils.py:50: RemovedInDjango19Warning: 'get_cache' is deprecated in favor of 'caches'.
  self.cache = cache.get_cache(cache_alias or cache.DEFAULT_CACHE_ALIAS)

Creating test database for alias 'default'...

real    0m53.102s
user    0m47.976s
sys     0m1.544s

The test works about 2-3 seconds, all other time it hangs in Creating test database for alias 'default'...

I think my database should be created in the memory very fast. I have no json dumps loaded. How can I make it faster? It seems I missed something...