# PC Doctor v1.6.0 Release Notes

## New in v1.6.0

### Performance Recorder & Problem Replay

PC Doctor v1.6.0 adds Performance Recorder, a local replay layer for significant slowdowns. It reuses the existing Timeline, Performance Analysis, PC Checkup, Hardware Monitor, and polling flow without adding duplicate continuous collectors.

Performance Recorder includes:

- automatic recording of significant Timeline events
- Dashboard Recent Performance Events card
- replay view for before, during, and after a slowdown
- CPU, RAM, disk, network, and health replay graphs
- process snapshots for top CPU/RAM processes
- likely cause and confidence
- recommendations
- search for terms such as Chrome, Defender, Memory, CPU, and Disk
- PDF, JSON, Markdown, and plain-text problem report exports

The root-cause engine is evidence-limited. It uses recorded metrics, event type, process snapshots, and hardware context; if the data does not support a specific cause, it says so instead of guessing.

## Included Recent Features

- v1.5 Hardware Monitor
  - battery and AC power state when available
  - GPU name/vendor detection
  - disk health status
  - safe unavailable states for CPU temperature, GPU usage, and fan speed
- v1.4 PC Checkup polish
  - real temp/cache estimate
  - Defender/Security status
  - Firewall status
  - Windows Update reboot/service status
- v1.3 PC Checkup
  - one-click health inspection
  - category scores
  - recommendations and exports
  - local checkup history
- v1.2 Performance Timeline
  - 24-hour local performance timeline
  - event markers and exports
- v1.1 Performance Analysis
  - health score
  - issue detection
  - plain-English recommendations

## Core Features

- Live system dashboard
- Process manager with safe End Task guardrails
- Startup Apps manager with reversible startup toggles
- System Health
- Hardware Monitor
- PC Checkup
- Performance Analysis
- Performance Timeline
- Performance Recorder
- Assistant and Settings pages
- Browser mock fallback for frontend preview

## Known Limitations

- GPU usage spike detection is future-ready but not active until real GPU usage data is implemented.
- CPU temperature and fan speed often remain unavailable because Windows does not expose safe generic sensor data on all machines.
- Disk health uses practical Windows CIM status rather than a full vendor SMART attribute dump.
- Process launch burst detection is inferred from event-time process snapshots, not true process deltas yet.
- Per-process network usage remains unavailable.
- Browser preview uses mock data by design.

## Installation

Recommended:

1. Run `PC Doctor_1.6.0_x64-setup.exe`.
2. Launch PC Doctor from the Start menu or installed shortcut.

Alternatives:

- `PC Doctor_1.6.0_x64_en-US.msi` is provided for MSI-based installs.
- `pc-doctor-v1.6.0-portable.exe` can be run directly without installer setup.

## Verification Status

Release verification completed:

- `cargo test`: passed
- `npm run test:frontend`: passed
- `npm run build`: passed
- `cargo check`: passed
- `npm run tauri build`: passed

See `V1.6-RELEASE-REPORT.md` for packaging and smoke-test results.