Optimizing Django Queries

Optimizing Django Queries

Use bulk queries, preload foreign keys, etc. Have you finished your next Django Web Application and it runs way too slow? Now you think you should have gone for C++ or Java?

Have you finished your next Django Web Application and it runs way too slow? Now you think you should have gone for C++ or Java? Come on, there is nothing to worry about, some refactoring of your code may make your application twice faster!

For example, instead of inserting objects one by one, you can insert 1000 objects at once. Another example is fetching data by foreign key — it hits the database every time. You can preload all needed data in advance, did you know that?


We will be playing with two really simple models here:

class Student(models.Model):
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)

class Grade(models.Model):
    student = models.ForeignKey(Student, on_delete=models.CASCADE)
    course = models.CharField(max_length=100)
    grade = models.IntegerField(default=0)

So, we have a lot of students, and these students have some grades. There is nothing simpler than that.

Analyze your queries

First, you need to see all interactions with the database. Namely, we would like to see all SQL queries that Django makes when you query for some data.

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