[perf-scan] 2026-10-21 -- performance opportunities found
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 78/100
- Issue type
- Bug
- Clarity
- Clearly specified
- Activity status
- Active
- Tech stack
- python
- Domain
- performance
Research direction
Read src/apm_cli/deps/download_strategies.py around lines 551–558 and check how the archive names are obtained from zf.namelist(). Replace the two list membership checks with the suggested indexed lookups or a set, then verify both membership cases still behave correctly. The issue identifies this as a low priority performance improvement during archive fetches.
Written by the indexing model from the issue text.
Description
Performance Scan - 2026-10-21
Automated scan of src/apm_cli/ for algorithmic performance anti-patterns.
1 finding identified (low priority).
Findings
[B] Linear scan on list (set opportunity) -- src/apm_cli/deps/download_strategies.py:551-558
- Current: O(n) --
target_name in namesandfile_path in namesscan thezf.namelist()list; runs once per archive fetch (per package, per candidate ref). - Proposed: O(1) membership via
zf.getinfo()in try/except KeyError, ornames_set = set(names). - Fix: Replace the two list membership checks with
zf.getinfo(...)lookups (ZipFile already indexes by name) or build a set once afternamelist(). Low priority: archive is already downloaded in memory, so gain is small.
Scan coverage
- src/apm_cli/ (499 files scanned)
- Patterns checked: A (quadratic loops), B (linear scan in loop),
C (unconditional expensive ops), D (redundant config parsing),
E (heavy top-level imports), F (sequential independent I/O) - Other Pattern B candidates reviewed (plugin_parser duplicate_skill_names, apm_resolver queued_keys, reachability visited) already use sets/dicts.
Generated by Daily Performance Scanner · copilot · auto · 18 AIC · ⌖ 0.563 AIC · ⊞ 11.1K · ◷
- expires on Oct 28, 2026, 1:32 AM UTC
- Dominant language
- Python
- Stars
- 4k
- Forks
- 393
- Avg merge
- 4d 12h
- Merged PRs (30d)
- 70
Getting set up
- No Dockerfile or Docker Compose file
- Has a pull request template
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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