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## Summary Fixes #388 — expanded groups were fetched sequentially with O(n) `packets.find()` lookups. ## Changes 1. **Parallel fetch**: Replaced sequential `for...of + await` loop in `loadPackets()` with `Promise.all()` so all expanded group children are fetched concurrently. 2. **O(1) Map lookup**: Replaced 3 instances of `packets.find(p => p.hash === hash)` with `hashIndex.get(hash)`: - `loadPackets()` expanded group restore (~line 553) - `select-observation` click handler (~line 1015) - `pktToggleGroup()` (~line 2012) ## Perf justification - **Before**: N expanded groups → N sequential API calls + N × O(packets.length) array scans - **After**: N parallel API calls + N × O(1) Map lookups - Typical N is 1-3 (minor severity as noted in issue), but the fix is trivial and correct ## Tests All existing tests pass: `test-packet-filter.js` (62), `test-aging.js` (29), `test-frontend-helpers.js` (433). Co-authored-by: you <you@example.com>
