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Kpa-clawbot
0b1924d401
## Summary Replace all `observers.find()` linear scans in `packets.js` with O(1) `Map.get()` lookups, eliminating ~300K comparisons per render cycle at 30K+ rows. ## Changes - Added `observerMap` (`Map<id, observer>`) built once when observers load - Replaced all 6 `observers.find()` call sites with `observerMap.get()`: - `obsName()` — called per row for observer name display - Region filter check in packet filtering - Observer dropdown label in filter UI - Group header region lookup - Child row region lookup - Flat row region lookup - Map is cleared on reset and rebuilt on each `loadObservers()` call ## Complexity - **Before:** O(k) per row × 30K rows = O(30K × k) where k = observer count (~10) - **After:** O(1) per row × 30K rows = O(30K) - Map construction: O(k) once, negligible ## Testing - All Go tests pass (`cmd/server`, `cmd/ingestor`) - All frontend tests pass (`test-packet-filter.js`: 62 passed, `test-aging.js`: 29 passed, `test-frontend-helpers.js`: 241 passed) Fixes #383 Co-authored-by: you <you@example.com>
