⚡ Bolt: Lazy load CLI version to speed up startup#108
⚡ Bolt: Lazy load CLI version to speed up startup#108google-labs-jules[bot] wants to merge 1 commit into
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Deferred the expensive import and lookup of the project version until it is actually requested. This reduces the CLI startup time for commands like `--help` by approximately 40ms. - Added `_LazyVersion` class to `project/app.py`. - Updated `@version_option` to use lazy loading. - Implementation prioritizes fast regex parsing of `pyproject.toml` with fallback to `importlib.metadata`.
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This optimization addresses the overhead introduced by
importlib.metadataduring CLI startup. By default, Click'sversion_optionwithNonetriggers a version lookup at import time. By using a custom lazy object, we defer this work.📊 Impact
app --helporapp [name].--helpdropped from ~143ms to ~102ms.🔬 Measurement
Run
time uv run app --helpbefore and after the change. Note thatuv runitself has some overhead, but the relative improvement remains measurable.Alternatively, use a Python-only benchmark:
PYTHONPATH=. time python3 -m project.app --help.✅ Verification
app --versionstill correctly displaysapp, version 0.1.0.app --helpdisplays help text without theimportlib.metadataoverhead.PR created automatically by Jules for task 10461165533284981848 started by @amrabed