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What is ActionUpdateDelay Property in DelphiVCL.Application?


ActionUpdateDelay property or DelphiVCL.Application.ActionUpdateDelay used to delay the call to DoActionIdle. This applies to native Windows development. The following example demonstrates the usefulness of this property:

  1. Create an MDI project with the main form, an MDI Child, and a TAction class.
  2. Link the TAction OnUpdate event to a method.
  3. Run the program and maximize the MDI child.

If you open Windows Task Manager, you can see that CPU usage for the MDI application is nearly 100%. However, if you set Application.ActionUpdateDelay to a non-zero value, the CPU usage for the application is significantly lower than 100%.

Let’s browse all the properties and methods of the DelphiVCL.Application.ActionUpdateDelay using dir() command:

See the responses in our Windows command prompt:


You can also read short information about the DelphiVCL.Application.ActionUpdateDelay using the print() command:

See the responses in our Windows command prompt:



Check out DelphiVCL which easily allows you to build GUIs for Windows using Python.

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