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[perf-scan] 2026-10-16 -- performance opportunities found

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
72/100
Issue type
Refactor
Clarity
Clearly specified
Activity status
Active
Tech stack
git, python
Domain
cli, performance

Research direction

Start in src/apm_cli/commands/update.py around lines 62-68, where GitCommandError and GitHubPackageDownloader are imported at module level, then check the helpers near lines 141 and 178 that use them. Move both imports into those functions and keep TYPE_CHECKING imports for annotations. Done when python -X importtime -m apm_cli no longer shows git loading for unrelated commands and apm update still works.

Written by the indexing model from the issue text.

Description

type/automation type/performance

Performance Scan - 2026-10-16

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

Findings
[E] Heavy top-level imports on CLI command modules -- src/apm_cli/commands/update.py:62-68
  • Current: from git.exc import GitCommandError (GitPython) and from ..deps.github_downloader import GitHubPackageDownloader (which imports git, Repo, etc.) load at module import time. They are used only in helpers at lines ~141 and ~178, so every CLI invocation pays the import cost (low priority).
  • Proposed: lazy import, with cost paid only when apm update runs.
  • Fix: Move both imports inside the functions that use them (keep TYPE_CHECKING imports for annotations). Verify with python -X importtime -m apm_cli that git is no longer loaded for unrelated commands.
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)
  • Pattern F: subprocess calls inside loops (github_downloader.py checkout_steps, tiered_ref_resolver.py candidates) appear order-dependent / short-circuiting, so not flagged.

Generated by Daily Performance Scanner · copilot · auto · 18.1 AIC · ⌖ 0.564 AIC · ⊞ 11.1K · ◷

  • expires on Oct 23, 2026, 1:28 AM UTC
Dominant language
Python
Stars
4k
Forks
387
Avg merge
4d 13h
Merged PRs (30d)
50

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