Hi Trailokya,
This could be due to the spying attributes.
Have you tried using Match Index? You could try to add/remove one attribute at a time to play with it, try click on Highlight button after each change. Match index is recommended because it is always more efficient. It should use the first element it comes across as matching the attributes rather than searching the entire document to verify there is only one that matches.
For a web app in Internet Explorer, it could be that the object is not attached to the correct iexplore.exe instance for HTML mode to work right. You can experiment by manually launching first and then attach using different Child Index values.
Some users has reported by reregistering OLEACC.DLL had helped them to resolved UIA spying performance issues, it could possibly serve as your another resolution option.
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InJoe Khor
Blue Prism
Blue Prism
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In Joe Khor
Sr. Product Consultant
Blue Prism