[perf-scan] 2026-09-18 -- no issues found

Performance Scan - 2026-09-18

Automated scan of src/apm_cli/ for algorithmic performance anti-patterns.
No confirmed findings.

Scan coverage

• src/apm_cli/ (484 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)

Notes

Candidate matches were reviewed across all six patterns and discarded as
false positives:

• Pattern A: high for-loop-count files (uninstall/engine.py,
  hook_integrator.py, context_optimizer.py, plugin_parser.py) contain
  nested loops, but each operates on small, bounded, per-package or
  per-directory collections (candidate placements, hook events, plugin
  skill dirs) with pre-built dict/set indexes (_build_children_index,
  exact_index/plugin_index in _resolve_marketplace_packages, pool dict
  in hook_ownership.reinject_apm_source_from_sidecar) already used to
  avoid O(n^2) scans.
• Pattern B: if x in dict/set membership checks found throughout
  install/, deps/, and commands/ are already against pre-built
  sets/dicts (seen_keys, locked_keys, allowed_hosts, exact_index), not
  raw lists.
• Pattern C: os.walk/glob calls (deployable_source_plan.py,
  plugin_parser.py, policy/discovery.py) run once per package/scan
  invocation, not in a per-item hot loop.
• Pattern D: script_runner.py's _load_config() and registry/
  operations.py's repeated os.getenv() calls are called at most a
  handful of times per command invocation, not in a per-dependency loop.
• Pattern E: CLI command modules (install.py, audit.py, etc.) already
  defer heavy subsystem imports to function scope; only lightweight
  stdlib/click imports remain at module level.
• Pattern F: subprocess.run calls inside loops (bare_cache.py,
  github_downloader.py) are sequential git config/fetch/checkout steps
  with a data dependency (fetch must precede checkout), not
  independent per-package I/O; parallel download phases already use
  ThreadPoolExecutor (install/phases/download.py, deps/apm_resolver.py,
  deps/revision_pins.py, registry/operations.py).

All hot-path code reviewed uses appropriate data structures and caching.

Generated by Daily Performance Scanner · copilot · auto · 103.2 AIC · ⌖ 4.67 AIC · ⊞ 9.7K · ◷

• expires on Sep 25, 2026, 1:36 AM UTC

This issue records an automated scan of src/apm_cli/ and reports no confirmed findings. The listed files and patterns were reviewed and dismissed, so there is no entry point or concrete change to start from. A maintainer would need to identify an actionable performance problem before work can be considered done.