问如何优化Django FormView以提高数据库性能

EN

class PatientNotes(SingleObjectMixin, FormView):

    slug_url_kwarg = 'patientId'
    slug_field = 'patientId'
    pk_url_kwarg = 'patientId'

    template_name = "patient/patient_detail.html"
    form_class = AddNewNoteForm

    def get_queryset(self):
        queryset = super(PatientNotes, self).get_queryset()
        self.current_patient = Patient.objects.get(patientId=self.kwargs['patientId'])
        my_result = queryset.filter(patient=self.current_patient)
        return my_result

    def post(self, request, *args, **kwargs):
        self.object = Patient.objects.get(patientId=self.kwargs['patientId'])
        return super().post(request, *args, **kwargs)

    def form_valid(self, form):
        self.object = form.save(commit=False)
        self.object.patient = Patient.objects.get(patientId=self.kwargs['patientId'])
        self.object.note_created_by_date = datetime.date.today()
        self.object.save()
        return super().form_valid(form)

    def get_success_url(self):
        return reverse('PatientDetailView', kwargs={'patientId': self.object.patient.patientId})