How to identify and stop background processes that slow down your PC

Summary

This guide helps you troubleshoot and resolve: How to identify and stop background processes that slow down your PC. Follow the steps below to fix the issue.

Common Causes

When your PC feels sluggish, background processes are often the culprits. By using Windows’ built‑in tools you can pinpoint which apps or services are hogging CPU, memory or disk resources and disable them safely. This guide walks you through the quick fixes and the deeper steps needed to restore optimal performance.

Quick Fix Steps

1. Press Ctrl+Shift+Esc to open Task Manager.
2. Click the Processes tab.
3. Click the CPU column header to sort by highest usage.
4. Select any process using an unusually high amount of resources and click End task.
5. Restart your computer and see if performance improves.

Detailed Instructions

Open Task Manager

1. Press Ctrl+Shift+Esc or right‑click the Start button and select Task Manager.
2. If the compact view appears, click More details at the bottom.

Identify resource‑heavy processes

1. In the Processes tab, sort by CPU, Memory and Disk to spot the biggest consumers.
2. Look for processes that consistently stay above 20‑30% CPU or use a large portion of RAM for extended periods.
3. For each suspect, note the Image name and Description columns to confirm it’s not a critical system service.

Disable unnecessary startup programmes

1. In Task Manager, switch to the Startup tab.
2. Review the Startup impact column.
3. Right‑click any programme with a High impact that you don’t need at boot and choose Disable.
4. Restart the PC to apply the changes.

Use Resource Monitor for deeper analysis

1. Open Run (Win+R) and type resmon, then press Enter.
2. In the CPU tab, expand the Processes with Disk Activity section to see which apps are constantly reading/writing.
3. Use the Network tab to identify background uploads or downloads that may be throttling bandwidth.

Adjust Windows services

1. Press Win+R, type services.msc and press Enter.
2. Scroll to services such as Windows Search, Superfetch (SysMain) or Print Spooler that you don’t use.
3. Right‑click the service, select Properties, change Startup type to Manual or Disabled, and click OK.
4. Reboot the computer to ensure the changes take effect.

Troubleshooting

Process restarts automatically after ending it

• Some applications are set to restart via the Task Scheduler. Open taskschd.msc, locate any task that launches the offending programme, and disable it.
• Check the programme’s own settings for “Run at startup” or “Resume after crash” options and turn them off.

Task Manager is missing or won’t open

• Run sfc /scannow from an elevated Command Prompt (Start → Windows Terminal (Admin)) to repair corrupted system files.
• If the issue persists, boot into Safe Mode and try opening Task Manager again.

System remains slow after disabling background apps

• Check for Windows updates: Settings → Update & Security → Windows Update → Check for updates.
• Run a full malware scan using Windows Defender or your preferred security suite.
• If the problem continues, consider restoring the system to a point before the slowdown began via System Restore.

If you’ve followed these steps and still experience performance issues, please Open a Ticket for further assistance.

Related Articles

• Computer running slow
• Browser not loading pages
• Applications freezing or crashing
• Blue screen of death (BSOD) - restart steps

Still Having Issues?