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A while ago at PyCon US 2026, I had the pleasure of listening to the Python Steering Council give updates about new features that are being added in Python 3.15. One that stood out was explicit lazy imports (via PEP 810), which defer module loading until first use. I am curious to see how this new feature works, and I want to benchmark its performance with PyCharm. Let’s take a look together.
Overview of explicit lazy imports
PEP 810 introduces an explicit syntax for lazy imports, allowing you to defer the loading and execution of modules until their attributes are actually accessed, unlike standard eager imports that execute immediately. This feature aims to significantly reduce startup latency and memory consumption. Explicitly marking modules as `lazy` can deliver substantial improvements in initial responsiveness and baseline resource usage in large-scale applications and command-line tools.
