old_contents: from django.conf import settings
  
  if settings.TEST_PERFORMANCE:
      from django.test import TestCase
      from django.core.urlresolvers import reverse
      from rest_framework.renderers import JSONRenderer
      from rest_framework_gis import serializers as gis_serializers
      from contexttimer import Timer
      from .models import Location
  
  
      class TestRestFrameworkGisPerformance(TestCase):
          NUMBER_OF_LOCATIONS = 10000
  
          def _create_data(self):
              """ creates a bunch of gis models instances """
              locations = []
              name = 'l{0}'
              slug = 'l{0}'
              wkt = 'POINT (13.{0}125000020002 42.{0}565179379999)'
              for n in range(1, self.NUMBER_OF_LOCATIONS):
                  locations.append(Location(name=name.format(n),
                                            slug=slug.format(n),
                                            geometry=wkt.format(n)))
              Location.objects.bulk_create(locations)
  
          def test_geojson_performance(self):
              class PerfSerializer(gis_serializers.GeoFeatureModelSerializer):
                  class Meta:
                      model = Location
                      geo_field = 'geometry'
              # create data
              self._create_data()
              # initialize serializer
              serializer = PerfSerializer(Location.objects.all(), many=True)
              with Timer() as t:
                  JSONRenderer().render(serializer.data)
              # print results
              msg = 'GeoJSON rendering of {0} objects '\
                    'completed in {1}'.format(self.NUMBER_OF_LOCATIONS, t.elapsed)
              print('\n\033[95m{0}\033[0m'.format(msg))
  
new_contents: import sys
  from django.conf import settings
  
  # this test must be run explicitly
  # either by calling:
  # django test --keepdb django_restframework_gis_tests.test_performance
  # or by setting ``settings.TEST_PERFORMANCE`` to ``True``
  if 'django_restframework_gis_tests.test_performance' in sys.argv or settings.TEST_PERFORMANCE:
      from django.test import TestCase
      from django.core.urlresolvers import reverse
      from rest_framework.renderers import JSONRenderer
      from rest_framework_gis import serializers as gis_serializers
      from contexttimer import Timer
      from .models import Location
  
  
      class TestRestFrameworkGisPerformance(TestCase):
          NUMBER_OF_LOCATIONS = 10000
  
          def _create_data(self):
              """ creates a bunch of gis models instances """
              locations = []
              name = 'l{0}'
              slug = 'l{0}'
              wkt = 'POINT (13.{0}125000020002 42.{0}565179379999)'
              for n in range(1, self.NUMBER_OF_LOCATIONS):
                  locations.append(Location(name=name.format(n),
                                            slug=slug.format(n),
                                            geometry=wkt.format(n)))
              Location.objects.bulk_create(locations)
  
          def test_geojson_performance(self):
              class PerfSerializer(gis_serializers.GeoFeatureModelSerializer):
                  class Meta:
                      model = Location
                      geo_field = 'geometry'
              # create data
              self._create_data()
              # initialize serializer
              serializer = PerfSerializer(Location.objects.all(), many=True)
              with Timer() as t:
                  JSONRenderer().render(serializer.data)
              # print results
              msg = 'GeoJSON rendering of {0} objects '\
                    'completed in {1}'.format(self.NUMBER_OF_LOCATIONS, t.elapsed)
              print('\n\033[95m{0}\033[0m'.format(msg))
  
subject: Allow explicit performance test with: