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Understanding Performance Issues When Using the Text and TextRange Control Patterns

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This topic describes performance issues associated with using the Text and TextRange control patterns.

The IUIAutomationTextPattern and IUIAutomationTextRange interfaces rely on cross-process calls—they do not provide a caching mechanism to improve performance when retrieving or processing textual content.

A client application can improve performance by using the IUIAutomationTextRange::GetText method to retrieve moderately sized blocks of text. For example, using GetText to retrieve single characters will incur a cross-process performance hit for each character, whereas not specifying a maximum length when calling GetText will incur one cross-process hit, but can have high latency depending on the size of the text range.

Working with Text-based Controls, UI Automation Support for Textual Content, About the Text and TextRange Control Patterns, UI Automation Client Programmer's Guide

For UI Automation Providers, see Text and TextRange Control Patterns