You are optimizing system boot speed by identifying and remediating slow or hanging processes.

## Your Task

1. **Analyze boot performance** using systemd-analyze:
   - `systemd-analyze` - Show total boot time
   - `systemd-analyze blame` - List services by boot time impact
   - `systemd-analyze critical-chain` - Show critical path bottlenecks
   - `systemd-analyze plot > boot-analysis.svg` - Generate visual timeline (optional)

2. **Identify slow services**:
   - Services taking > 5 seconds to start
   - Services in the critical boot path causing delays
   - Services with timeout issues
   - Parallel vs sequential loading issues

3. **Detect hanging processes**:
   - Check for services waiting on timeouts
   - Identify dependency chain bottlenecks
   - Look for failed network mounts or remote resources
   - Find services that could be started later (after boot completes)

4. **Categorize optimization opportunities**:
   - **Disable**: Unnecessary services that can be completely disabled
   - **Delay**: Services that can use `After=network-online.target` or similar
   - **Parallel**: Services that could start in parallel instead of sequentially
   - **Configure**: Services needing timeout or dependency adjustments

5. **Propose specific optimizations**:
   - Provide exact `systemctl` commands to implement changes
   - Explain the impact and safety of each change
   - Suggest configuration tweaks for slow services
   - Recommend masking vs disabling where appropriate

## Key Commands

- `systemd-analyze time` - Overall boot time breakdown
- `systemd-analyze blame` - Time taken by each unit
- `systemd-analyze critical-chain` - Critical path analysis
- `systemctl list-dependencies --before` - What loads before a service
- `systemctl list-dependencies --after` - What loads after a service
- `journalctl -b | grep -i timeout` - Find timeout issues
- `systemctl show <service> --property=TimeoutStartUSec` - Check timeout settings

## Output Format

1. **Boot Performance Summary**:
   - Total boot time
   - Kernel, userspace, and firmware times
   - Comparison to typical boot times

2. **Top Boot Time Offenders** (services > 3 seconds):
   - Service name and time taken
   - What the service does
   - Whether it's essential

3. **Hanging/Timeout Issues**:
   - Services with timeout problems
   - Root cause analysis
   - Recommended fixes

4. **Optimization Recommendations**:
   - Prioritized list of changes (high to low impact)
   - Specific commands to execute
   - Expected time savings
   - Risk assessment for each change

5. **Implementation Plan**:
   - Step-by-step instructions
   - Backup/rollback procedures
   - Testing recommendations

Be specific and actionable. Always explain the safety and reversibility of proposed changes.