Xiaomi phone slow or lagging? 4 settings to check (HyperOS 3)

Device

Android

Shown on

Xiaomi Redmi Note 15 Pro 5G (25080RABDG), HyperOS 3.0.308.0, Android 16

App

Settings

Path

Settings › Additional settings › Memory extension

Real screenshots

4 of 4 steps

Checked

October 2026

Sources

1 official, linked below

Step by step

1. 

   Close apps in Recents

   Swipe up from the bottom and hold to open Recents. Swipe an app card away to close it, or tap X to close all. Close the apps you are done with.

   Done

2. 

   Free up storage

   Open the Security app and tap Deep clean, one of the tiles under the big score (38.7 GB/256 GB occupied on ours). Uninstall apps and Clear app data show what can go. A nearly full phone slows down.

   Done

3. 

   Check Memory extension

   Go to Settings, Additional settings, Memory extension. It uses storage as extra RAM. Ours was set to 4.0 GB; the choices were Off, 4.0, 6.0 and 8.0 GB.

   Done

4. 

   Check the animation scales

   If Developer options is on, open it from Settings, Additional settings. Window animation scale, Transition animation scale and Animator duration scale should read Animation scale 1x, as on ours.

   Done

If you do not see this option

• No Developer options? It is hidden until you turn it on from OS version in About phone. If you never turned it on, the scales are at the default.
• No Memory extension in Additional settings? Xiaomi's guide gives the same route. Search Settings for Memory extension if your list differs. Source: Generic User Guide for HyperOS 3.0
• Short on storage? The page says to use Memory extension only when there is enough storage space available. Free space first. Source: Generic User Guide for HyperOS 3.0

If this does not work

• Apps reopen slowly after closing? A closed app starts from scratch next time, so keep the ones you use often open.
• Slow after an update? The update page says the phone optimises in the background for 1 to 3 days after an update.
• Still slow? Restart the phone: how to turn off or restart a Xiaomi phone.

About this guide

These are the settings on the phone that affect speed. On ours, Memory extension was set to 4.0 GB and the animation scales were all at 1x.

The screenshots are from our Redmi Note 15 Pro 5G with Xiaomi HyperOS 3.0.308.0 and Android 16, in Light mode. We only opened these screens and changed nothing.

Good to know

Turn on Developer options: how to turn on Developer options. Apps closing on their own? Xiaomi closing apps in the background.

In short: Recents, X. Security, Deep clean. Settings, Additional settings, Memory extension. Developer options, animation scales 1x.