Performance Optimization: High CPU usage by "System" process
4.5
The "System" process in Task Manager consumes 20-50% CPU constantly.
Symptoms
- Fan noise
- Slow UI
- High CPU in idle
Possible Causes
- Buggy driver
- Windows Update stuck
- Hardware interrupt storm
Step-by-Step Fix
1
Update Drivers
Use a tool like LatencyMon to find which driver is causing interrupts.
2
Disable Fast Startup
Fast startup can cause driver state issues that lead to high CPU.
3
Check Windows Update
Ensure no updates are stuck in a loop.
When to See a Technician
High System CPU is usually a driver trying to talk to hardware that isn't responding correctly.
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