An application that uses scrolling graphics may experience heavy lag / low frame rate

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Article ID: CTX296692

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Updated On:

Description

Neuro Works is an application used by neurologists to view and playback studies of patient EEGs. When they open Neuro Works through Citrix, users can define speed and time-based settings to view these EEGs. When viewing, these EEGs scroll across the screen from left to right, and this "playback" may result in a low frame rate which can be experienced as choppiness or stuttering by the user.

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

Solution for Citrix Virtual Apps and Desktops 2303 and earlier:

Create the following registry key underneath HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Graphics\
Name: GlyphCacheBehaviour
Type: DWORD
Value = 0

This registry value disables the glyph caching feature.

Solution for Citrix Virtual Apps and Desktops 2305 and later (including 2402 LTSR):

Improvements were made in Citrix Virtual Apps and Desktops 2305 that automatically turn off glyph caching in such use cases. As such, this registry value is not needed in Citrix Virtual Apps and Desktops 2305 or later.

Problem Cause

EEG screen updates can be miscategorized as glyphs and result in poorer performance.

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