After you apply MS15-106: Cumulative security update for Internet Explorer: October 13, 2015 (KB3096441), load times are very long because of high CPU utilization in Internet Explorer 11.
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 MS16-095: Security update for Internet Explorer: August 9, 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.