Improve Accuracy of Citrix Director's Interactive Logon Times

From:
http://xenappblog.com/2016/optimize-logon-times/
https://lalmohan.co.nz/2015/10/07/citrix-xenapp-long-logon-times-and-potential-fixes/

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Serialize]
"StartupDelayInMSec"=dword:00000000