Django Slow Performance in Querying Related Models with Prefetch Related
I can't seem to get I recently switched to I'm not sure how to approach This might be a silly question, but I've looked through the documentation and I'm still confused about I'm facing a performance issue when querying related models in my Django application....... Using Django 4.0, I attempted to optimize my database queries by implementing `prefetch_related` to reduce the number of queries executed, but I'm still experiencing slow performance in certain scenarios. Specifically, I have a `Book` model that has a foreign key relationship with an `Author` model, and I'm trying to retrieve all books along with their authors. Here's the code I used: ```python from django.db import models class Author(models.Model): name = models.CharField(max_length=100) class Book(models.Model): title = models.CharField(max_length=200) author = models.ForeignKey(Author, related_name='books', on_delete=models.CASCADE) # Query with prefetch_related books = Book.objects.prefetch_related('author').all() ``` Despite using `prefetch_related`, my query performance remains slow, especially when the `Author` table has a large number of entries. After monitoring the database, it appears that Iām still executing many queries rather than a single one. I have also tried using `select_related`, but that doesn't seem appropriate here due to the one-to-many relationship. I even ran an `EXPLAIN` on the generated SQL and saw that there are still many rows being scanned. I've tried profiling the Django ORM queries using `django-silk` and confirmed that most of the time is spent during the query execution rather than in view rendering. Is there something Iām missing in my approach, or additional optimizations I can implement to improve performance? Any suggestions or alternative methods would be greatly appreciated! This is part of a larger CLI tool I'm building. What's the best practice here? The stack includes Python and several other technologies. Any pointers in the right direction? This is for a mobile app running on Windows 10. What am I doing wrong? I'm coming from a different tech stack and learning Python. For reference, this is a production CLI tool.