1
“Let’s use Kubernetes.” Now you have eight problems
For smaller teams, Kubernetes is usually the wrong solution: too complex, too complicated, and with too much work to keep it running.
Itamar Turner-Trauring
Helping you deploy with confidence, ship higher quality code, and speed up your application.
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Visit pythonspeed.com → RSS feedOn Hacker News May 2019 – Aug 2026
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2
When your data doesn’t fit in memory: the basic techniques
You can process data that doesn’t fit in memory by using four basic techniques: spending money, compression, chunking, and indexing.
3
Simple Dockerfile examples are often broken by default
Most Dockerfile examples for Python you’ll find on the Web are broken. And that’s a problem.
4
Alpine makes Python Docker builds slower, and images larger
Alpine Linux is often recommended as a smaller, faster Docker base image. But if you’re using Python, it will slow down your build and make your image larger.
5
Copying data is wasteful, mutating data is dangerous
Copying data wastes memory, and modifying/mutating data can lead to bugs. Learn how to implement a compromise between the two in Python: hidden mutability.
6
A deep dive into the official Docker image for Python
The “official” Python Docker image is useful, but to actually understand why, and to use it correctly, it’s worth understanding how exactly it’s constructed.
7
How many CPU cores can you use in parallel?
Figuring out how much parallelism your program can use is surprisingly tricky.
8
Faster Python calculations with Numba
Python-based calculations, especially those that use NumPy, can run much faster by using the Numba library.
9
Loading Pydantic models from JSON without running out of memory
Pydantic’s JSON loading uses a huge amount of memory; here’s how to reduce it.
10
Loading NumPy arrays from disk: mmap() vs. Zarr/HDF5
Learn how to load larger-than-memory NumPy arrays from disk using either mmap() (using numpy.memmap), or the very similar Zarr and HDF5 file formats.
11
Measuring memory usage in Python: it’s tricky
Measuring your Python program’s memory usage is not as straightforward as you might think. Learn two techniques, and the tradeoffs between them.
12
Faster floating point math with Rust's new API
Compilers have a hard time optimizing floating point math. Rust has a new API to fix this.
13
The security scanner that cried wolf
If you’ve ever been alarmed by how many security vulnerabilities your Docker image has, even after you’ve installed security updates, here’s what’s going on.