An error occurred in which the operation of the PC abnormally slows in the Windows 10 update

ByDoba Kung

On Wednesday May 11, 2016 of Japan timereleaseThere is a possibility that the operation of Windows 10 may become abnormally slow if you install the cumulative update "KB 3156421" for Windows 10 which was done by user's pointed out.

KB 3156421 - Computer is slow after installing latest Cumulative Update: Windows 10
https://www.reddit.com/r/Windows10/comments/4iqaig/kb3156421_computer_is_slow_after_installing/

Possibility of abnormally slow operation in Windows 10 update - targeted for "KB 3156421" released on 10th - PC Watch
http://pc.watch.impress.co.jp/docs/news/20160511_756756.html

KB 3156421 for Windows 10 update is "10586.318" for OS build, and it is targeted for many Windows 10 general users. Updates include Cortana, Bluetooth, Internet Explorer 11, Microsoft Edge, Miracast, improving USB reliability, improving memory leaks when opening PDF filesIncludedis.

Cumulative Update for Windows 10 Version 1511 and Windows Server 2016 Technical Preview 4: May 10, 2016
https://support.microsoft.com/en-us/kb/3156421

The phenomenon that the behavior of Windows 10 becomes heavy due to KB 3156421 is not occurring in all Windows 10 terminals that installed KB 3156421 but is thought to be related to troubles with audio personal assistant "Cortana".

If KB 3156421 causes Windows 10 to become heavy, symptoms may be alleviated if Cortana is turned off, and Reddit user John WinkMeasures to be takendoing. First, click the Cortana search box and click the three line menu button.


Click "Notebook".


Click "Setting".


Since the top button is on, click it ... ...


It is done if it is set to "OFF".