In some environments like a Citrix server, there are a lot of processes launching as the system starts up. Users may also see issues when opening their workspace since they are using the resources on the Citrix server to run their virtual environment.

The following registries can be used on the agent to troubleshoot the issue. These registries will allow a delay on the startup procedure of the agent until the system has launched successfully. This avoids deadlock situations during login.

1. • 32-bit OS - HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc
   • 64-bit OS - HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc

     EnableProcessScanForStartUp=0
     EnableProcessScanWhenScan=0

     Process Image Scan enumerates all system processes and associated files and scans for integrity. This can create a performance issue during startup because the client is trying to access the files as they are being scanned.

2. • 32-bit OS - HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\PC-cillinNTCorp\CurrentVersion\RealTimeScan Configuration
   • 64-bit OS - HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\RealTimeScan Configuration
     DWORD:NTRtScanInitSleep=18000

     This pause the launch of Reatimescan by the indicated amount of milliseconds to alleviate scanning conflicts on necessary system files.

3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TmFilter\Parameters
   DWORD:DisableCtProcCheck=1

   This disables process ID comparison in close table entries to prevent close table entries increasing. This won't affect normal malware scanning.

These settings can be changed in the ofcscan.ini file on the Server to be sent out globally. The default location of the ofcscan.ini file on the Security Server is <Server Installation Folder>\Trend Micro\OfficeScan\PCCSRV\ofcscan.ini.

1. EnableProcessScanForStartUp and EnableProcessScanWhenScan

   [Global Setting]
   EnableProcessScanForStartUp={x}
   EnableProcessScanWhenScan={y}
   
   Where "x":
   
   "0" - Disables the "Process Image File Scan" function when clients start
   "1" - Enables the "Process Image File Scan" function when clients start (default)
   
   Where "y":
   
   "0" - Disables the "Process Image File Scan" function when clients perform manual or scheduled scans
   "1" - Enables the "Process Image File Scan" function when clients perform manual or scheduled scans (default)

2. NTRtScanInitSleep

   Under the "[Global Setting]" section, add the following key and assign the appropriate value.
   
   [Global Setting]
   NTRtScanInitSleep=millisecond
   
   For example:
   NTRtScanInitSleep=60000

3. TmfilterDisableCtProcCheck

   [Global Setting]
   TmfilterDisableCtProcCheck=1

You can also follow the workaround from Microsoft and Citrix to check if the performance issue during logon will be resolved:

• Microsoft: Slow logon with a blank screen in Windows
• Citrix: Slow Logon with a Black Screen in XenDesktop Server VDA