On the afternoon of the 26th, July, Xiaomi officially released a new MIUI 9 system with the main theme of "fast as lightning" that it will be still smoth after using for a long time in Beijing. It is said to be the fastest Android system up to now that the Xiaomi Mi6 with the new system provide an impressive speed for the users.

The first batch of models including Mi 6, Xiaomi Redmi Note 4X. The users of these models who applied to experience the closed test can update the phone through the OTA online upgrade (development / experience version of the user) and manual line brush machine (stable version of the user). It is said that MIUI 9 supports dynamic resource allocation that can intelligently allocate the resource requirements of each application in order to ensure that the application is using the smooth experience, which has not applied on the phone of the Xiaomi Mi Note 2.

In addition, it has many new functions, including application startup acceleration, continuous automatic cleaning and new file system optimization measures. Xiaomi official claimed that in the daily 6 hours of comprehensive use test, the phone equipped with MIUI 9 will be more smoth than other systems applied on mobile phones like the Xiaomi Mi MIX. It is reported that although the Xiaomi Mi 5X with the Snapdragon 625 processor, its performance is excellent as the Xiaomi Mi6 Pro for it with the MIUI 9 system.