How to Enable SpeedScreen Latency Reduction for Web Interface Applications

  • CTX344154
  • Created onMar 26, 2014
  • Updated onApr 22, 2014
Article Topic Interoperability, Load Balancing/High Availability


This article describes how to enable SpeedScreen Latency Reduction for NFuse/Web Interface applications.


To enable the feature, modify the Template.ica file or default.ica by completing the following steps:

In NFuse, Web Interface 2.x, and 3.x

Edit the template.ica file in the [NFuse_IcaWindow] section

In Web Interface 4.x and 5.x

Edit the default.ica file located in the folder \Inetpub\wwwroot\Citrix\MetaFrame\conf or \XenApp\conf
In the [Application] section, add:

When ICA Connection Center is opened SpeedScreen Latency Reduction is ON regardless of the latency thresholds configured on the XenApp server.

SpeedScreen Latency Reduction can also be configured with the following options for ZLKeyboardMode and ZLMouseMode:
0 – SpeedScreen Latency Reduction is OFF, regardless of the latency thresholds configured on the server.
2 – SpeedScreen Latency Reduction is set to AUTO, and will turn on or off based on the latency thresholds configured on the server.

Configuring the Server

SpeedScreen Latency Reduction must also be configured on each server. The procedure is the same for Presentation Server 4.5, XenApp 5, XenApp 6 and XenApp 6.5.

  1. Click All Programs > Citrix > Administration Tools > SpeedScreen Latency Reduction Manager from the Start menu.
    The default configuration is to enable mouse click feedback for all applications. The default high latency threshold is 500 milliseconds and the low threshold is 50 milliseconds. A value of 500 milliseconds might be too high for some scenarios. This must be adjusted through the testing of latency and performance to get the desired number for the high threshold. Right click on the server name to adjust the properties.

    SPEED SCREEN Server Properties

    Applications can also be added for more granular control.

  2. Select a new application from the application menu and browse to the local EXE. By default, Enable local text echo for this application is selected.

    Specify Application Settings

    Right clicking on the application name provides more options.

    Application Settings


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