difference between filter with multiple arguments and chain filter in django

Question

What is the difference between filter with multiple arguments and chain filter in django?

Answer 1

The performance difference is huge. Try it and see.

Model.objects.filter(condition_a).filter(condition_b).filter(condition_c)

is surprisingly slow compared to

Model.objects.filter(condition_a, condition_b, condition_c)

As mentioned in Effective Django ORM,

• QuerySets maintain state in memory
• Chaining triggers cloning, duplicating that state
• Unfortunately, QuerySets maintain a lot of state
• If possible, don’t chain more than one filter