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Explorer freezes or right-click is slow: find the shell extension

Verified 2 min read

Diagnose Windows 11 Explorer hangs and slow context menus with Event Viewer, Reliability Monitor, clean boot and shell-extension isolation.

Tested onPro (26H2) · Build 26300.9457 · x64
E1
Build
26300.9457
Edition
Pro (26H2)
Architecture
x64
Support
Documentation (E1)
Evidence
E1Official documentation
Verified
2026-10-28
Page type
Troubleshoot

The short answer

Section titled “The short answer”

Explorer hangs are often a shell extension (right-click menu, cloud sync, archive, PDF, antivirus) or a driver/disk problem, not “Windows being slow”.

Check:

  1. Is CPU/disk actually busy?
  2. Does it hang only on right-click, only on a folder, or everywhere?
  3. What was installed/updated before it started?
  4. Does a clean boot fix it?

Evidence first

Section titled “Evidence first”
  • Event Viewer → Windows Logs → Application: Application Hang / Application Error for explorer.exe.
  • Reliability Monitor: the app/driver installed before the first hang.
  • Task Manager: disk queue/CPU during the hang.
  • Safe Mode/clean boot: if it disappears, it is a third-party component.
Terminal window
Get-WinEvent -LogName Application -MaxEvents 100 |
  Where-Object ProviderName -match 'Application Hang|Application Error'

Isolate shell extensions

Section titled “Isolate shell extensions”
  1. Clean boot (msconfig → hide Microsoft services → disable all → reboot) for a test.
  2. If Explorer is stable, re-enable half the non-Microsoft services, then narrow.
  3. Use Autoruns (Sysinternals) → Explorer tab to see shell extensions; uncheck one at a time.
  4. Right-click menu handlers live under HKCR\*\shellex\ContextMenuHandlers and Directory\shellex\ContextMenuHandlers; do not delete keys blindly.
  5. Uninstall the offending app or update it; re-check after reboot.

Other common causes

Section titled “Other common causes”
  • Cloud sync (OneDrive/Dropbox/Google Drive) scanning a huge folder.
  • Antivirus scanning on access; test with a narrow exclusion, not by disabling protection permanently.
  • Bad thumbnail/icon cache: rebuild only after the extension check.
  • Failing disk: Event Viewer disk errors, SMART warnings; back up first.
  • GPU driver: Explorer uses the GPU; a bad driver can cause flicker/hang.
  • Network drives: a disconnected mapped drive can block Explorer; disconnect it.

If it is only one folder

Section titled “If it is only one folder”
  • Count items; a folder with 100k files will be slow.
  • Check for a corrupt file/thumbnail; switch to Details view.
  • Move the folder to a local disk and test.
  • Check permissions/offline files.

When to reset

Section titled “When to reset”

If clean boot and shell-extension isolation do not help, run DISM/SFC, update the GPU/chipset driver, and create a new user profile to separate profile corruption from system corruption. Reset/reinstall is the last step, not the first.

Sources