The Redmi 9 series has long been considered a benchmark for the budget segment, offering decent performance at an affordable price. However, over time, even the most reliable devices can face slowdowns, long launches of applications and unexpected freezes. Users often wonder why the once-fast device suddenly began to “think” every time you touch the screen.
The main reason lies in the natural wear and tear of the software and the accumulation of system “garbage”. the MIUI operating system, based on Android, tends to overgrow temporary files, cache and background processes that consume the resources of the processor. In addition, modern applications are becoming more demanding on the hardware, which creates an additional load on the hardware of the budget smartphone.
In this article, we will discuss in detail the technical and software aspects that affect the speed of your gadget, you will learn how to correctly diagnose the problem, which settings should be changed first and whether you should resort to radical methods such as resetting to factory settings.
Hardware limitations and memory wear
The first thing to consider is the physical characteristics of the device. The Redmi 9 is equipped with MediaTek Helio G80 or G85 processors, which, despite their popularity, are of either initial or medium performance, and when used for several years, even a slight shortage of RAM becomes critical.
The type of internal memory is worth paying special attention. This model often uses eMMC 5.1, which is much slower than modern UFS. Over time, memory cells wear out, write and read speeds drop, which directly affects how quickly programs open and the system boots.
⚠️ Note: The internal memory is more than full 90% This causes a dramatic decrease in the speed of writing data. 3-4 GB space.
The physical wear of the battery can also be ignored. Although the battery is not directly responsible for the speed of the processor, the system can artificially limit performance to prevent a sudden shutdown during peak loads. If your device is several years old, the degradation of battery chemistry could trigger the activation of the power saving mode at the core level of the system.
There is a myth that installing "acceleration" apps helps, and in fact, these programs often just take up space in RAM and create unnecessary background processes, making things worse.
Overloading storage and application cache
One of the most common reasons why the Xiaomi Redmi 9 is slowing down is the sheer lack of space: When the internal drive is full, the system lacks the resources to create temporary files and swaps, causing interface lags.
Social media and instant messengers like Telegram, WhatsApp and Viber have the ability to grow to giant sizes, storing thousands of images, videos and voice messages that are often unnecessary to the user but continue to take up precious gigabytes.
For effective cleaning, follow the following steps:
- 🗑️ Open the Security app and use the built-in cleaner to delete temporary files.
- 📸 Go through the file. DCIM Screenshots by removing unnecessary photos and videos or transferring them to a memory card.
- 💬 In the settings of each messenger, find the section "Data and storage" and clear the cache of media files.
It's important to understand the difference between cleaning up cache and cleaning up data. Cache is temporary files that can be deleted safely. Data is your logins, passwords and correspondence, and deleting them will result in a complete reset of the application.
Background processes and program autoload
MIUI is known for its aggressive application management policies, but sometimes users install dozens of programs that run with the system, each of which consumes CPU time and RAM, even if you are not using it at the moment.
To find out which heavyweights you can use, go to Settings → Advanced Settings → Memory Statistics, where you can see which programs consume the most resources, often games, navigators or online shopping apps are at the top.
You should also check your boot settings, and many programs prescribe themselves in a start-up to start instantly when you turn on the phone, which slows down the boot of the smartphone itself and puts a strain on the system from the first seconds of operation.
☑️ Optimizing autoloading
It is recommended to leave only messengers in auto-run to avoid missing notifications. Other applications, such as marketplaces, news aggregators and games, are better to run manually as needed.
The Impact of MIUI and Android Updates
Often, users notice that the phone started to slow down as soon as the system update arrived, which is due to the fact that new versions of MIUI are optimized for more powerful hardware, and older devices may not cope with the increased demands of the interface and animations.
After a major update, the system indexes files and optimizes applications in the background, a process that can take anywhere from a few hours to a couple of days, during which the smartphone may not work smoothly.
| MIUI version | Features of influence | Recommendation |
|---|---|---|
| MIUI 11/12 | Basic stability | Optimal for Redmi 9 |
| MIUI 13/14 | Weighted interface | Cache cleaning required |
| HyperOS | High demands | Possible lags on older versions |
If the situation does not improve within a week after the update, it makes sense to consider rolling back on the previous firmware version or performing a full reset.
Should I turn off system updates?
Interface animations and visual effects
Beautiful transitions and animations are Xiaomi’s calling card, but they often cause visual delays on low-refrequency budget screens. The processor takes time to render each frame, and if it’s busy with other tasks, you see “slowdown.”
To make the interface more responsive, you can scale down the animations. You need to activate the developer menu. Go to Settings → About phone and quickly press 7 times on the MIUI version.
After activating the developer menu, follow the following steps:
- 🛠️ Go to the Advanced Settings → For developers.
- 📉 Find the items: "Window animation", "transition animation", "Duration of animation".
- ⚙️ Set the value 0.5x or off for all three parameters.
This simple manipulation creates the illusion of speeding up the smartphone, making the response instantaneous, and visually the phone will appear much faster, as the delays in switching between screens will disappear.
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Use a dark theme and static wallpaper. Dynamic live wallpaper consumes significant CPU and battery resources, which is especially critical for the Redmi 9.
Radical measures: Resetting and reflashing
If software optimization methods fail, the last and most effective way is to completely reset to factory settings, which allows you to remove all the accumulated over the years of use of “garbage”, conflicting files and errors in the registry of the system.
Important: Before you do this, make sure to back up all your important data to your Mi Cloud, computer, or external memory card, and all your internal memory will be permanently deleted.
To perform the reset, go to Settings → About Phone → Settings Reset → Erase all data. The process will take 5 to 15 minutes, after which the phone will turn on as new.
⚠️ Warning: Do not interrupt the reset process or turn off the phone until the progress bar reaches 100.
In some cases, especially if the device was purchased with Chinese firmware or has undergone modifications, it may be necessary to completely flash through the computer using the Mi Flash Tool utility.
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Hard Reset eliminates 95% of software speed problems if there is no physical damage to the board components.