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UIA performance/WinDbg: slow response when pressing Alt+Tab after pressing Control+D from WinDbg #8535
Reported by @tspivey via Skype: UIA responds slowly when pressing Alt+Tab from WinDbg.
Steps to reproduce:
Switching between apps is very slow.
Switching between apps is snappy.
NVDA Installed/portable/running from source:
2018.2.1 and alpha.15634
Windows 10 versions 1803 and Insider Preview
Name and version of other software in use when reproducing the issue:
Other information about your system:
@tspivey uses version 1803, while I use Insider Preview.
Does the issue still occur after restarting your PC?
Have you tried any other versions of NVDA?
Possibly caused by WinDbg itself.
For Version 1803 (build 17134), remove UIA name and value properties from properties to event ID's dictionary in UIA handler. This resolves this, although it raises the question as to which window is causing performance issues when firing name change and/or value change events.
In Insider Preview, use IUIAutomation6::CoalesceEvents (RS5, the flag must be set to 1/enabled).