Nov 28, 2019 02:00 AM|Yang Shen|LINK
Not sure what's the cause of the delay?
I think this is a browser performance issue. I suggest you could use the Performance module of your Chrome DevTools to see which part took it so long to fire the highlight event.
About how to use the Chrome DevTools Performance, please refer to Performance Analysis Reference and Get
Started With Analyzing Runtime Performance.
Highlighting issue and Extenders (Calendar and ModalPopup) not remaining visible is also in occurring in Opera Browser. Popups are shown and then immediately go away rather than remain visible in IE and FF.
As for these two questions, you can open a new thread with related code and let more community members help. A new thread will give your more possibility to solve the new problems.