# Track Specification: Performance Dashboard (performance_dashboard_20260306)

## Overview
Expand performance metrics panel with CPU/RAM usage, frame time, input lag with historical graphs. Uses existing performance_monitor.py which has basic metrics but no visualization.

## Architectural Constraints
- **60fps Constraint**: Metrics collection MUST NOT impact frame rate.
- **Thread Safety**: Cross-thread metrics MUST use proper synchronization.

## Functional Requirements
- **CPU/RAM Graphs**: Display rolling CPU and RAM usage over time.
- **Frame Time**: Show frame time histogram.
- **Input Lag**: Track and display input-to-response latency.
- **Historical Data**: Maintain rolling window of metrics history.

## Acceptance Criteria
- [ ] CPU graph shows rolling history.
- [ ] RAM graph shows rolling history.
- [ ] Frame time histogram displays.
- [ ] Input lag metrics tracked.
- [ ] Uses existing performance_monitor.py.