are django querysets fastest? - performance

Question

models.py
class Comments(UUID):
user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
post = models.ForeignKey(Posts, on_delete=models.CASCADE)
comment = models.ForeignKey(
"self", on_delete=models.CASCADE, blank=True, null=True
)
text = models.TextField()
files = models.ImageField()
serializers.py
class CommentSerializer(serializers.ModelSerializer):
class Meta:
model = Comments
fields = "__all__"
extra_kwargs = {
"user": {"read_only": True},
"text": {"required": False},
"files": {"required": False}
}
def create(self, validated_data):
user = self.context["request"].user
return Comments.objects.create(user=user, **validated_data)
views.py
class PostCommentsRetrieveAPIView(generics.RetrieveAPIView):
serializer_class = CommentSerializer
def get(self, request, *args, **kwargs):
replies_count = Subquery(Comments.objects.filter(
comment=OuterRef("pk")
).values("comment").annotate(count=Count("pk")).values("count"))
comment_remarks = Subquery(Remarks.objects.filter(
comment=OuterRef("pk")
).values("comment").annotate(count=Count("pk")).annotate(
popularities=popularities
).values("popularities"))
# https://stackoverflow.com/questions/63020407/return-multiple-values-in-subquery-in-django-orm
replies = Subquery(Comments.objects.filter(
comment=OuterRef("pk")
).values("comment", "created_at", "updated_at").annotate(
created=Now() - F("created_at"), created_=created_,
updated=Now() - F("updated_at"), updated_=updated_
).annotate(
details=ArrayAgg(
JSONObject(
id="id",
user_id="user_id",
username="user__profile__username",
text="text",
files="files",
created="created_",
updated="updated_",
profile_link=profile_link,
profile_image=profile_picture,
comment_remarks=comment_remarks,
replies_count=replies_count
)
)
).values("details"))
comment = Subquery(Comments.objects.filter(
post=OuterRef("pk"), comment=None
).values("post", "created_at", "updated_at").annotate(
created=Now() - F("created_at"), created_=created_,
updated=Now() - F("updated_at"), updated_=updated_
).values("created_").annotate(
details=ArrayAgg(
JSONObject(
id="id",
user_id="user_id",
username="user__profile__username",
text="text",
files="files",
created="created_",
updated="updated_",
profile_link=profile_link,
profile_image=profile_picture,
comment_remarks=comment_remarks,
comment_replies=replies
)
)
).values("details"))
post = Posts.objects.filter(id=kwargs["post_id"]).annotate(
comment=comment,
).values("comment")
return Response(post, status=status.HTTP_200_OK)
Now I just want to ask is that a best way show comments on post with nested replies, I create another files to calculate datetime, profile link, profile image, remarks on comment
this query is hitting database only one time my question is will it be fastest query to get data from database?
how to can I check that my query is fastest or not