[perf-scan] 2026-09-15 -- performance opportunities found

Performance Scan - 2026-09-15

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

Findings

[F] Sequential independent I/O -- src/apm_cli/registry/operations.py:292-310

• Current: O(n) sequential registry HTTP round-trips -- batch_fetch_server_info
  loops over server_references and calls
  self.registry_client.find_server_by_reference(server_ref) once per
  iteration, with no data dependency between iterations. Each call performs
  its own search_servers() + get_server() network request, so wall time
  grows linearly with server count. The sibling method
  check_servers_needing_installation (same class, lines 40-104) already
  solves the identical fan-out with a bounded ThreadPoolExecutor(max_workers=4),
  confirming this is an established, applicable pattern in this file.
• Proposed: O(n/max_workers) wall time using the same bounded
  ThreadPoolExecutor approach already used a few dozen lines above in the
  same class.
• Fix: Wrap the for server_ref in server_references: loop body in a
  ThreadPoolExecutor(max_workers=4) and use executor.map to fetch each
  server's info concurrently, mirroring check_servers_needing_installation's
  _check_one pattern, then populate server_info_cache from the results.

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)

Generated by Daily Performance Scanner · copilot · auto · 112.2 AIC · ⌖ 6.03 AIC · ⊞ 10.1K · ◷

• expires on Sep 22, 2026, 1:38 AM UTC