When this issue occurs, it takes more than one second to enter each character in large content editable DIV, even though the spelling checker feature is disabled in Internet Explorer 11. This problem occurs in a Windows 10, Windows 8.1, or Windows 7 environment.
To fix this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer.
Note This update was first included in the MS16-023: Security update for Internet Explorer: March 8, 2016.
Microsoft has confirmed that This is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.