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+---
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+phase: 01-cpu-optimization
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+verified: 2026-01-25T23:15:00Z
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+status: passed
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+score: 6/6 must-haves verified
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+---
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+
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+# Phase 1: CPU Optimization Verification Report
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+
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+**Phase Goal:** Eliminate all identified CPU hotspots and verify performance targets.
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+**Verified:** 2026-01-25T23:15:00Z
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+**Status:** passed
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+**Re-verification:** No - initial verification
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+
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+## Goal Achievement
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+
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+### Observable Truths
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+
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+| # | Truth | Status | Evidence |
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+|---|-------|--------|----------|
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+| 1 | No console.log in main.qml MouseArea handlers | ✓ VERIFIED | Lines 86-96: `onPressed`, `onPositionChanged`, `onClicked` only call `backend.resetActivityTimer()` |
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+| 2 | No debug console.log in ConnectionStatus.qml | ✓ VERIFIED | File is 25 lines total with no console.log statements |
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+| 3 | No debug console.log in ExecutionPage.qml | ✓ VERIFIED | File is 422 lines with no console.log statements |
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+| 4 | Screen timeout uses event-driven scheduling | ✓ VERIFIED | Line 144: `setSingleShot(True)`, no 1-second polling timer |
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+| 5 | WebSocket handler only emits signals when values change | ✓ VERIFIED | `_on_ws_message()` (lines 315-364) has no print statements, emits only on value change |
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+| 6 | Pattern preview paths are cached in a dictionary | ✓ VERIFIED | `_preview_cache` dict at line 108, cache lookup at lines 431-432 |
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+
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+**Score:** 6/6 truths verified
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+
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+### Required Artifacts
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+
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+| Artifact | Expected | Status | Details |
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+|----------|----------|--------|---------|
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+| `dune-weaver-touch/qml/main.qml` | No console.log in MouseArea handlers | ✓ VERIFIED | Lines 86-96 clean |
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+| `dune-weaver-touch/qml/components/ConnectionStatus.qml` | No debug console.log | ✓ VERIFIED | 25 lines, no console.log |
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+| `dune-weaver-touch/qml/pages/ExecutionPage.qml` | No debug console.log | ✓ VERIFIED | 422 lines, no console.log |
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+| `dune-weaver-touch/backend.py` | Event-driven timer + cache | ✓ VERIFIED | setSingleShot(True), _preview_cache implemented |
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+
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+### Key Link Verification
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+
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+| From | To | Via | Status | Details |
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+|------|-----|-----|--------|---------|
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+| main.qml MouseArea | backend.resetActivityTimer() | Direct call | ✓ WIRED | Lines 87, 91, 95 |
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+| backend._screen_timer | _screen_timeout_triggered | timeout.connect | ✓ WIRED | Line 145 |
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+| _find_pattern_preview | _preview_cache | Dictionary lookup | ✓ WIRED | Lines 431-432, 462, 474 |
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+
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+### Requirements Coverage
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+
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+| Requirement | Status | Notes |
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+|-------------|--------|-------|
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+| REQ-LOG-01 through REQ-LOG-06 | ✓ SATISFIED | All QML console.log removed |
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+| REQ-TIMER-01, REQ-TIMER-02 | ✓ SATISFIED | Event-driven single-shot timer implemented |
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+| REQ-WS-01, REQ-WS-02 | ✓ SATISFIED | No prints in `_on_ws_message()`, signals emit on change only |
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+| REQ-CACHE-01, REQ-CACHE-02 | ✓ SATISFIED | Preview cache dictionary implemented with clear method |
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+
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+### Anti-Patterns Found
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+
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+| File | Line | Pattern | Severity | Impact |
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+|------|------|---------|----------|--------|
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+| backend.py | Various | print statements | ℹ️ Info | These are operational logs (not in hot paths) |
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+
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+**Note:** The backend.py file still contains print statements, but these are:
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+- Connection/disconnection status messages
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+- API call logging for debugging
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+- Error messages
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+
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+These are NOT in the hot path (`_on_ws_message`) and do not impact CPU performance since they fire rarely (on user actions or connection events, not continuously).
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+
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+### Human Verification Required
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+
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+### 1. CPU Usage Test
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+**Test:** Run the touch app on a Raspberry Pi for 60 seconds while idle, monitor with `htop` or `top`
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+**Expected:** CPU usage under 20%
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+**Why human:** Requires physical hardware and runtime measurement
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+
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+### 2. Screen Timeout Functionality
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+**Test:** Set a 30-second screen timeout, wait without touching the screen
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+**Expected:** Screen turns off after 30 seconds
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+**Why human:** Requires hardware screen control verification
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+
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+### 3. Touch Wake Functionality
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+**Test:** After screen turns off, touch the screen
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+**Expected:** Screen wakes up immediately
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+**Why human:** Requires physical touch input verification
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+
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+### 4. UI Responsiveness
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+**Test:** Scroll through pattern list, interact with controls
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+**Expected:** No lag or stuttering
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+**Why human:** Subjective feel assessment
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+
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+## Verification Commands Used
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+
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+```bash
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+# Check for console.log in QML (result: 0 matches)
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+grep -r "console.log" dune-weaver-touch/qml/ | wc -l
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+# Result: 0
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+
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+# Check screen timer is single-shot (result: found)
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+grep "setSingleShot(True)" dune-weaver-touch/backend.py
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+# Result: Line 131 (reconnect timer), Line 144 (screen timer)
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+
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+# Check 1-second polling removed (result: no matches)
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+grep "_screen_timer.start(1000)" dune-weaver-touch/backend.py
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+# Result: No matches
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+
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+# Check preview cache exists (result: 7 matches)
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+grep "_preview_cache" dune-weaver-touch/backend.py
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+# Result: Lines 108, 431, 432, 462, 474, 481, 483
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+```
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+
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+## Conclusion
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+
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+All 6 must-have truths have been verified in the actual codebase:
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+
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+1. **QML Logging Cleanup** - Complete. Zero console.log statements in QML files.
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+2. **Event-Driven Timer** - Complete. Screen timer uses `setSingleShot(True)` instead of continuous polling.
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+3. **WebSocket Optimization** - Complete. No print statements in message handler, signals only emit on value change.
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+4. **Preview Caching** - Complete. Dictionary cache with lookup-before-search and cache invalidation method.
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+
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+The phase goal of eliminating CPU hotspots has been achieved at the code level. Human verification is required for:
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+- Runtime CPU measurement on Pi hardware
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+- Screen timeout/wake functionality
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+- UI responsiveness testing
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+
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+---
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+
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+*Verified: 2026-01-25T23:15:00Z*
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+*Verifier: Claude (gsd-verifier)*
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