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[perf-scan] 2026-10-19 -- performance opportunities found

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
78/100
Issue type
Refactor
Clarity
Clearly specified
Activity status
Active
Tech stack
python
Domain
cli, performance

Research direction

Read src/apm_cli/commands/uninstall/engine.py around lines 633–671 and trace how matched_dep and packages_to_remove are built. Check how package identity and ordering are handled, then add a companion set for membership checks while retaining the list. Done means duplicate entries are still excluded, output order is preserved, and the uninstall behavior remains correct.

Written by the indexing model from the issue text.

Description

type/automation type/performance

Performance Scan - 2026-10-19

Automated scan of src/apm_cli/ for algorithmic performance anti-patterns.
1 finding(s) identified (low priority).

Findings
[B] Linear scan inside a loop -- src/apm_cli/commands/uninstall/engine.py:633-671
  • Current: O(n*m) -- if matched_dep not in packages_to_remove does a list membership test on every iteration of the for package in packages loop.
  • Proposed: O(n) with a companion set of seen entries.
  • Fix: Keep a seen set next to the packages_to_remove list (when entries are hashable, or key by get_identity()), check it instead of the list, and keep the list for ordering.
  • Note: low priority; the uninstall package list is typically small (user-typed args).
Scan coverage
  • src/apm_cli/ (489 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)
  • Depth: Pattern A/B hot spots were reviewed by sampling the highest-count files; the other patterns were not exhaustively confirmed.

Generated by Daily Performance Scanner · copilot · auto · 18.5 AIC · ⌖ 0.561 AIC · ⊞ 11.1K · ◷

  • expires on Oct 26, 2026, 1:36 AM UTC
Dominant language
Python
Stars
4k
Forks
393
Avg merge
4d 23h
Merged PRs (30d)
62

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