#35102: Performance regression on Model.objects.count() between Django 4.2 and
5.0
-------------------------------------+-------------------------------------
Reporter: Anthony Shaw | Owner: (none)
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: 5.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by Simon Charette):
* cc: Simon Charette (added)
Comment:
> get_aggregation has an additional call to replace_expressions which
spends a lot of time in the slow inspect module
One way we could cut the time spent in `Expression.identity` significantly
would be to cache (e.g. at class initialization time) the
`inspect.signature(cls.__init__)` signature as it represents the vast
majority of the time spent by `replace_expressions`
[[Image(https://cdn.zappy.app/dd47f5e7d4c03baff4726eb106e0d440.png)]]
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Ticket URL: <https://code.djangoproject.com/ticket/35102#comment:8>
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