Tzhizhu
Home / developer-tools / Fix High CPU Usage by MsMpEng.exe (Windows Defender) - Access Denied Windows Search Troubleshooting Guide-Fix Windows Security Real-Time Protection Slowdown

Fix High CPU Usage by MsMpEng.exe (Windows Defender) - Access Denied Windows Search Troubleshooting Guide-Fix Windows Security Real-Time Protection Slowdown

Updated 2026-06-13 15:29:43developer-tools
Fix High CPU Usage by MsMpEng.exe (Windows Defender) - Access Denied Windows Search Troubleshooting Guide-Fix Windows Security Real-Time Protection Slowdown
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

Related Software Guides

How to Fix Docker Container Exit Code 1 on Startup How to Fix Docker Container Exit Code 1 on Startup UFW Allow Port Range Not Opening: Fixes and Checks UFW Allow Port Range Not Opening: Fixes and Checks How to Fix Microsoft Store Not Starting in Windows 11 How to Fix Microsoft Store Not Starting in Windows 11 Fix Cloudflare SSL Flexible Redirect Loop and Permission Denied Fix Cloudflare SSL Flexible Redirect Loop and Permission Denied How to Fix Windows Security Migration Failed Error How to Fix Windows Security Migration Failed Error Fix Chrome ERR_CONNECTION_RESET on Windows 10 Fix Chrome ERR_CONNECTION_RESET on Windows 10