wfshell.exe consumes high CPU
Article ID: CTX579025
Updated On:
Description
While the ICA session is closed, Citrix WinFrame Shell (wfshell.exe) process doesn't exit.
This process consumes high CPU in Task Manager.
Environment
Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.
Resolution
Disable Twain Hook using below registry and reboot the VDA machine.
HKLM\SOFTWARE\Wow6432Node\Citrix\CtxHook\AppInit_Dlls\Twain Hook
Value Name: Flag
Type: REG_DWORD
Value: 0
HKLM\SOFTWARE\Wow6432Node\Citrix\CtxHook\AppInit_Dlls\Twain Hook
Value Name: Flag
Type: REG_DWORD
Value: 0
Problem Cause
From dump log, most threads that have consumed high CPU are related to Twain.dll.
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