Measured per-step timings, rather than guessing where the time went:
Pre-commit checks Install dependencies 63s (next slowest: 16s)
Python tests Install dependencies 49s (pytest itself: 35s)
Both workflows re-downloaded ~80 packages from PyPI on every run. The
Node workflows already cache npm; the Python ones were the outliers.
* cache: pip on actions/setup-python in both, keyed on
meta/requirements.txt -- the REAL file, not the root symlink, since
the key is hashed from the file at the given path and hashing a
symlink is not hashing its target. (That same symlink already cost
us a silently-skipped workflow earlier today.)
* ~/.cache/pre-commit via actions/cache@v4, keyed on
.pre-commit-config.yaml. pre-commit builds a virtualenv per hook repo
on first use, which costs more than the pip install itself, and it
only needs rebuilding when a hook's repo or rev changes.
The first run after this lands is a cache miss and will be no faster;
the saving starts from the second.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PJrqKERAo5QUeEHWS5Asgp
