How to diagnose and fix high CPU usage on Windows

High CPU usage can come from services, drivers, malware, or misconfigured apps.

Identify the process
- Open Task Manager → Sort by CPU
- Note the process name and PID
Use Resource Monitor
- Task Manager → Performance → Open Resource Monitor
- Check which services are tied to the process
Check system services
- Press Win + R → services.msc
- Disable unnecessary services (carefully)
Analyze startup programs
- Disable non-essential startup items
- Reboot and observe behavior
Scan for malware
- Use Windows Defender Offline Scan
Check for driver issues
- Device Manager → Look for warning icons
- Update or roll back drivers
Use Event Viewer
- Look for recurring system errors

Result: pinpoint the exact cause instead of guessing.

Permanent