As the Xiaomi MIUI system is the Android system by the depth of customization, the underlying code has a lot of optimization, so MIUI system at the end of the package upgrade speed will be slower. Resently, Xiaomi MIUI8 for Android 7.0 development beta was officially released. It is reported that the upgrade includes the models were Xiaomi 5s,Xiaomi mi 5s Plus, Xiaomi Mi Note 2, Xiaomi Mi Mix.

The specific update as follows, if you like the new system, you can go to MIUI official website to download.
System add upgrade to Android N, welcome to upgrade experience
Lock screen, status bar, notification bar
Fix the issue area of the notification bar does not appear
Fix the correct password for the wrong question
Desktop Optimize the sliding response time
Optimize loading speed (drastically reduce load time)
Fix the problem of recovery immediately after recovery
In some cases, the icon does not show the problem

And the specific update information to xiaomi official website based.Although MIUI8 has been upgraded to Android 7.0,but MIUI9 is being developed, when the xiaomi mi mix 2 and xiaomi mi note 3 released in the second half of this year, they should be directly equipped with MIUI9,with a poeful system.