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How to Fix Windows Slow After Update on Windows

PC running slow after a Windows update? Fix post-update performance issues including sluggish boot, high resource usage, and unresponsive apps.

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Main Troubleshooting Guide

How to Fix Slow Computer

Complete symptoms, causes, and step-by-step solutions

Symptoms

You might be experiencing this problem if you notice:

  • Computer noticeably slower after Windows Update
  • Boot time increased significantly
  • High CPU or disk usage after update
  • Apps take longer to open than before
  • System becomes unresponsive for minutes after login
  • Background processes consuming resources post-update

Common Causes

  • Windows re-indexing files after update
  • New update installing additional components in background
  • Driver incompatibility with new Windows version
  • Windows Update cache consuming disk space
  • Corrupted update leaving system in inconsistent state
  • Compatibility telemetry running post-update

Solutions

Solution 1: Wait and Let Background Tasks Complete

  1. 1After a major update, Windows needs 30-60 minutes to settle
  2. 2Let your PC sit idle with power connected
  3. 3Check Task Manager — look for Windows Modules Installer Worker
  4. 4If disk usage is high from SearchIndexer, let it complete
  5. 5Restart after background tasks finish

Solution 2: Clear Windows Update Cache

  1. 1Open Command Prompt as Administrator
  2. 2Run: net stop wuauserv
  3. 3Run: del /f /s /q C:\Windows\SoftwareDistribution\Download\*
  4. 4Run: net start wuauserv
  5. 5Go to Settings > System > Storage > Temporary files
  6. 6Check and delete "Windows Update Cleanup"

Solution 3: Uninstall the Problematic Update

  1. 1Go to Settings > Windows Update > Update history
  2. 2Click "Uninstall updates"
  3. 3Find the most recent update
  4. 4Click Uninstall and confirm
  5. 5Restart your computer
  6. 6Pause updates for 7 days while waiting for a fix
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