I'm using django and django rest framework to make a query from all users in data that have a permission sent as a url parameter but this query is taking too long.

I'm user pycharm debugger how can I try to check why is it taking to long, this is the function:

@list_route(url_path='permission/(?P<permission>.+)')
def read_permission(self, request, *args, **kwargs):
    serializer = self.get_serializer_class()
    qs = get_user_model().objects.filter_by_permission(self.kwargs.get('permission'))
    qs = qs.order_by(Lower('username'))
    return Response(serializer(qs, many=True).data)

Update

Adding the serializer

class UserSerializer(UserLabelMixin):
    user_permissions = serializers.SlugRelatedField(many=True, read_only=True, slug_field='codename')

    class Meta:
        model = get_user_model()
        fields = ['id', 'email', 'is_superuser', 'is_staff', 'label',
                  'full_name', 'first_name', 'last_name', 'username',
                  'teams', 'date_joined', 'last_login',
                  'user_permissions', 'groups', 'ui_preferences', 'internal_project',
                  'staff_id', 'oem_id', 'oem_email', 'oem_department', 'comment']
        read_only_fields = fields