High CPU or Memory Usage in Windows

Common symptoms

• Computer running very slowly
• Fan running constantly at high speed
• Programs taking long time to open
• System freezing or becoming unresponsive

Possible causes

• Malware or virus infection
• Background programs using resources
• Windows processes running amok
• Insufficient RAM for running applications

Step-by-step solution

1. Identify Resource-Heavy Processes

   Use Task Manager to find processes using high CPU or memory

   Press Ctrl + Shift + Esc
   Click on "CPU" or "Memory" column to sort by usage
   Identify processes using >50% consistently

   Note: Normal idle CPU usage should be under 10%

2. End Unnecessary Processes

   Close programs and processes that aren't needed

   In Task Manager, select high-usage process
   Click "End task"
   Confirm the action

   Warning: Don't end Windows system processes unless you're sure

3. Run Full System Antivirus Scan

   Check for malware that might be consuming resources

   Open Windows Security (Windows Defender)
   Go to "Virus & threat protection"
   Click "Quick scan" or "Scan options" for full scan

   Note: A full scan may take 1-2 hours but is more thorough

4. Disable Startup Programs

   Prevent unnecessary programs from starting with Windows

   Press Ctrl + Shift + Esc
   Click "Startup" tab
   Right-click high-impact programs
   Select "Disable"

   Note: Keep only essential programs in startup

5. Update Windows and Drivers

   Install updates that may fix performance issues

   Press Windows + I
   Go to Update & Security
   Click "Check for updates"
   Install all available updates

   Note: Some Windows updates specifically address performance issues

Alternative solutions

• Use Resource Monitor for more detailed process analysis
• Clean boot Windows to isolate problematic software
• Add more RAM if consistently running out of memory

When to seek professional help

• Suspected malware that antivirus can't remove
• Hardware diagnostics needed
• Professional system optimization required