As the Xiaomi MIUI system is Android system by the depth of customization, the bottom of the code has a lot of optimization, so MIUI system at the end of the package upgrade speed will be slower. But recently released Xiaomi mi6 and Xiaomi mi max 2 directly use the Android 7.0 OS.
Xiaomi mi 6
Xiaomi MIUI8 for Android 7.0 development beta was officially released on June 16th. It is reported that the upgrade the models include Xiaomi mi 5s, Xiaomi mi 5s Plus, xiaomi mi note 2, xiaomi mi mix .The updates include:
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
Optimize the sliding response time
Optimize loading speed (drastically reduce load time)
Fix the problem of recovering the backup after the backup
In some cases, the icon does not show the problem

Of course ,the specific update information we need to wait until the xiaomi official announce.And MIUI official announced that stop MIUI8 released update,So MIUI9 will come and the upcoming released xiaomi mi note 3 will carry MIUI9 which is based on Android 7.0 OS.So the phone seems very great.