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ZoomText performance considerations

ZoomText performance considerations

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You are experiencing performance issues when ZoomText is running. Below are some items to consider which may help.

Suggested steps

  • Ensure that the PC or laptop being used confirms to the minimum Zoomtext system requirements.
  • If your system has a 4K screen with a high resolution, change the resolution down to 1920×1080.
  • If you are using a second screen, please connect it directly to your system using an HDMI/VGA/DVI connection, and not through a USB docking station or similar.
  • There are known performance issues with accessibility applications in Windows builds released around 2017 and 2018. Use Windows 10 builds 1903 or 1909 or higher if possible, as Microsoft made many performance fixes and fixes for these UIA issues.
  • Update ZoomText as much as you can, and test with the latest version where possible. Performance enhancements are frequently made within updates.
  • Update the driver for the system’s display adapter, from the laptop’s manufacturer where applicable.
  • Disable desktop effects in Windows by going to Control Panel, System, Advanced System Settings, Performance Settings button, “Adjust for best performance”, OK.
  • For systems with multiple display adapters (i.e. laptops with switchable graphics), the preferred display adapter can be selected from ZoomText menu>Preferences>Display Adapter.

Font smoothing

The default “Clearsharp” geometric smoothing uses pixel shading which can be intensive on the system’s GPU. Changing Geometric Smoothing to Legacy alleviates this.

  1. Open the ZoomText menu, go to Preferences, then Smoothing.
  2. Set Geometric smoothing to Legacy, and press OK.
  3. Open the ZoomText menu, go to Configuration, then Save as default.

The xFont smoothing is the best level of font smoothing available in ZoomText, but it is not supported in all applications and it can have a significant performance burden in some applications.
To disable this option:

  1. Open the ZoomText menu, go to Preferences, then Smoothing.
  2. Uncheck “Use xFont Smoothing”, and press OK.
  3. Open the ZoomText menu, go to Configuration, then Save as default.

Additional performance-improving settings

These more advanced settings changes will reduce ZoomText’s CPU burden.
Locate the following file:
C:\ProgramData\Freedom Scientific\ZoomText\2022\ZoomTextConfig.xml
We’d recommend making a copy of this file before making any changes.
Open this in a text editor such as Notepad, and make the following changes:

Find the line:
<Property name="FocusTimerInterval" value="250" />
and change the value to 1250 so it reads:
<Property name="FocusTimerInterval" value="1250" />

Find the line:
<Property name="DisableUiaEvents" value="false" />
Change to:
<Property name="DisableUiaEvents" value="true" />

Find the line:
<Property name="DisableMsaaEvents" value="false" />
Change to:
<Property name="DisableMsaaEvents" value="true" />

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