Windows High CPU Usage (Safe Fixes)

Why CPU usage becomes high

Common causes include:

• Too many background apps
• Windows Update running in the background
• Malware or unwanted apps
• Outdated GPU or chipset drivers
• Overheating CPU throttling performance
• Search indexing or telemetry services
• Corrupted system files
• Apps stuck in a loop (Chrome, Discord, Steam, etc.)

Step‑by‑step troubleshooting

1. Restart your PC

Clears stuck processes and resets CPU load.

2. Check Task Manager

Task Manager → sort by CPU → identify the app using the most CPU.

3. Close heavy background apps

Chrome, Discord, Steam, OneDrive, and game launchers often spike CPU.

4. Update GPU drivers

Outdated GPU drivers can cause CPU spikes and stutters.

5. Disable startup apps

Task Manager → Startup → disable anything unnecessary.

6. Run System File Checker (safe)

sfc /scannow

7. Run DISM repair (safe)

DISM /Online /Cleanup-Image /RestoreHealth

8. Check for overheating

High temps cause CPU throttling → which looks like high CPU usage.

Advanced CPU usage fixes

Fix Windows Update CPU spikes

Windows Update can cause temporary CPU spikes while downloading or installing updates.

• Settings → Windows Update → Pause updates → Resume
• Run Windows Update Troubleshooter
• Undo latest update if CPU issues started recently

Fix SearchIndexer.exe high CPU

Windows Search indexing can spike CPU usage, especially on HDDs.

• Settings → Privacy & Security → Searching Windows
• Set “Find My Files” to Classic
• Pause indexing temporarily

Fix RuntimeBroker.exe high CPU

This process manages app permissions and can get stuck.

• Settings → System → Notifications → turn off unnecessary notifications
• Disable background apps you don’t use

Fix Antimalware Service Executable high CPU

Windows Security may spike CPU during scans.

• Let the scan finish (usually 5–10 minutes)
• Schedule scans for off‑hours
• Exclude large folders like Steam or Adobe libraries

Check for malware (common cause)

Malware often causes high CPU usage by running hidden processes.

Run a Full Scan:

• Windows Security → Virus & threat protection → Full Scan

Fix CPU throttling (overheating)

When your CPU overheats, it slows down — causing high CPU usage symptoms.

• Clean dust from vents and fans
• Ensure airflow around the PC
• Use a cooling pad (laptops)
• Check fan speeds with manufacturer software

Update chipset drivers

Chipset drivers control CPU power management — outdated ones cause spikes.

• Download from your motherboard or laptop manufacturer
• Install → Restart PC

Quick Fix Summary (10 Safe Fixes)

Related Guides

• Windows Slow Performance
• Windows Freezing / Random Freezes
• File Explorer Not Responding
• Windows Update Not Working
• Windows Black Screen