Where Your Django Request Time Actually Goes
Removing Django's entire default middleware chain saved 0.02 ms per request. Fixing one N+1 query on the same view saved 3.30 ms.
performance
5 posts
The Real Cost of an async Call
Awaiting a coroutine that never suspends costs 53 ns against 24 ns for a plain call. Wrapping the same coroutine in a Task and awaiting it costs 28,958 ns.
The GIL Is Not a Lock on Your CPU
Eight threads of pure-Python arithmetic run at 0.98x the speed of one. The same eight threads doing IO run at 7.90x. The GIL is a scheduler, and it has a dial.
What import Actually Does
Importing asyncio costs 21.9 ms and pulls in 100 modules. Importing email costs 0.1 ms and pulls in one. Granularity predicts import cost; size does not.
The Shape of a Python Object
An instance with three attributes costs 96 bytes, not the 344 that sys.getsizeof reports, and __slots__ makes attribute reads slower on CPython 3.13.