Cache Clearing on Xiaomi Redmi 9 Pro: 5 Ways to Free Memory and Speed Up Your Smartphone

Xiaomi Redmi 9 Pro is a popular smartphone with a powerful Snapdragon 720G processor and 4/6 GB of RAM, but even it eventually begins to “slow down.” The main reason is a crowded cache of applications and systems that takes up precious space and slows down. In this article, we will discuss how to properly clear the cache on Redmi 9 Pro without the risk of losing personal data, and also tell you what types of cache exist and when to delete them.

Many users confuse cache with user files (photos, videos, documents) and are afraid to clean it. In fact, cache is temporary files that are created by applications and the system to speed up repeated operations. For example, when you open Instagram or YouTube, the application stores thumbnails, authorization data and other elements in the cache so that the next run it will load faster. However, over time, these files accumulate and begin to interfere.

It’s important to understand that clearing the cache doesn’t delete your accounts, game saves, or media files, but it can reset some application settings (such as the language in messengers or the theme of the registration). If the app is slower after cleaning, it’s okay: it just caches the data again.

What is cache and why should it be cleaned on Redmi 9 Pro

Cache (from English cache - "cache") is of three types:

• 📱 App cache – temporary files created by each app installed (for example, WhatsApp stores thumbnails of chats here, and Google Maps – maps for offline browsing).
• 🖥️ System cache – data that Android uses to speed up the interface (animations, fonts, icons).
• 🗃️ Dalvik cache – Optimized versions of apps created by the Android Virtual Machine for quick launch.

On the Redmi 9 Pro with factory-made MIUI firmware, the cache can take anywhere from 500MB to 3-5GB, depending on the number of applications installed. When memory is scarce, the system begins to hang out: apps open longer, animations twitch, and in severe cases, the phone can spontaneously reboot.

Cleaning the cache is recommended in the following cases:

• ⚡ The phone became noticeably slower to work (hangs, lags when scrolling).
• 📉 In the storage settings, the system shows “Cache occupied” more than 1 GB.
• 🔄 Apps crash or don’t update (e.g. Play Market issues error 927).
• 📱 After updating MIUI There are interface glitches.

⚠️ Warning: Don’t clean the cache too often (e.g. once a week) This can backfire, with apps having to continually reassemble temporary files, which will increase the CPU load and reduce battery life.

Method 1: Clearing the cache of individual applications through settings

The safest method is to remove the cache only for the applications that take up the most space, and it doesn’t affect system files and doesn’t require rebooting.

Instructions:

1. Open Settings → Applications → Application Management.
2. Slip on the three dots in the upper right corner and select Sort by size.
3. Select an app with a large cache volume (such as Facebook, TikTok or Google Chrome).
4. Press Warehouse. → Clear the cache.

For convenience, we have compiled a table of applications that most often “clog” the cache on Redmi 9 Pro:

If you want to clear the cache for all apps at once, go to Settings → Storage → Cache Data and click Clear.This is faster but less controlled – you won’t see how much space has been freed up for each application.

Synchronize application data with the cloud (Google Drive, Mi Cloud)

Remember passwords from accounts (if you do not use autocomplete)

Close all background applications

Connect your phone to charge (the process can take 5-10 minutes)-->

Method 2: Using a built-in MIUI cleaner

MIUI has a built-in Cleanup tool (formerly Security) that automatically finds and deletes unnecessary files, including cache, which is suitable for novice users, as it does not require manual application search.

How to use:

1. Open the Cleanup app (icon with broomstick).
2. Press Deep Clean (at the bottom of the screen).
3. Wait for the analysis to be completed (usually 10–30 seconds).
4. Select the Cash App category and click Clear.

Advantages of this method:

• 🔍 Automatically finds “junk” even in hidden folders.
• 📊 It shows how much space can be freed up.
• 🛡️ Does not delete important system files (unlike manual cleaning through Recovery).

⚠️ Attention: In the section Deep cleaning MIUI may suggest removing APK-Do not agree if you are not sure, it may disrupt some functions.

If the Cleanup app is not on your Redmi 9 Pro, it can be installed via the Play Market or downloaded from the official APK from Xiaomi’s website. Also check if it is disabled in the settings: Settings → Apps → Show all apps → Cleanup.

Method 3: Clearing the cache with Recovery Mode (for power users)

If the phone is slowing down or not loading because of a crowded cache, you can use Recovery Mode, a special recovery mode, which removes all types of cache, including system and Dalvik, but does not affect user data.

Step-by-step:

1. Turn off the Redmi 9 Pro.
2. Press the Volume Up + Power buttons at the same time and hold them for 10-15 seconds until the MI logo appears.
3. Release the buttons. You will be taken to the Recovery menu (control is done by the volume and power buttons).
4. Select Wipe & Reset (or Wipe Cache Partition in older versions of MIUI).
5. Confirm the action and wait until it is completed (usually takes 1-3 minutes).
6. Select Reboot to System to restart.

This method is useful if:

• 🐢 The phone became unbearably slow even after a routine cleaning.
• 🔄 After updating MIUI Errors (e.g., gestures or Wi-Fi not working).
• 📱 Applications are constantly being crashed with the error "Application is stopped".

⚠️ Note: Do not confuse Wipe Cache Partition with Wipe Data/Factory Reset! The second option will completely reset the phone to factory settings, deleting all your data.

If the phone still doesn't work well after cleaning the cache through Recovery, it could be the damaged system files, and then just flashing or resetting to factory settings will help.

Method 4: Automatic cleaning with third-party applications

If you don't want to manually clean your cache, you can use third-party utilities that offer additional features like scheduling or removing duplicate files, but beware: some "optimizers" may display false virus warnings or offer paid features.

Top.-3 Proven applications for Redmi 9 Pro:

• 🧹 CCleaner – a classic cleaner with analysis of cache, history and unnecessary APK.
• 🔍 Files by Google – Google’s official app that finds large cache files and suggests removing them.
• 🛡️ SD Maid – advanced utility for power users (requires root rights for complete cleaning).

How to use Files by Google:

1. Install an app from the Play Market.
2. Open it and go to the Cleanup tab.
3. Click Free Space and select the Cash App category.
4. Mark the unnecessary files and tap Clear.

Warning: Some apps (like Clean Master) can aggressively delete files, including useful ones, and check if your messaging apps and social media services are working after using them, sometimes having to log in again.

💡

If the app is slower after cleaning the cache, try restarting it or restarting the phone. The cache will be recreated, but without the junk files.

Method 5: Clean Dalvik cache (root users only)

Dalvik cache is an optimized version of the apps that the Android virtual machine creates to speed up their work. It is usually stored in the /data/dalvik-cache folder and can take up to 1-2 GB. It only makes sense to clean it if you have installed custom firmware or updated MIUI manually.

To clean the Dalvik cache, root rights will be required. If they are not, skip this section - wrong actions can lead to a bootloop (a looped phone reboot).

Instructions for experienced users:

1. Install a file manager with root support (such as Root Explorer or Solid Explorer).
2. Go to /data/dalvik-cache.
3. Delete all files inside (or simply rename the folder by adding.bak at the end).
4. Reboot the phone. The system will automatically recover the Dalvik cache.

You can also clean Dalvik cache through custom Recovery (for example, TWRP):

1. Download to TWRP (button combination depends on version).
2. Choose Advanced → Wipe Dalvik Cache.
3. Confirm the action and restart.

⚠️ Note: Cleaning Dalvik cache without rooting or TWRP If you are not sure about your actions, you should use standard methods (through settings or Recovery Mode).

What to do if cleaning the cache does not help

If the Redmi 9 Pro continues to slow down after all the manipulations, the problem may not be in the cache.

• 🔋 Check battery power: at levels below 15%, the system automatically limits performance.
• 📱 Turn off animations: go to Settings → The phone. → Version. MIUI (tap 7 times to open Developer Settings, then to Developer Settings → The scale of the animation is off..
• 🚫 Remove unused apps: Even if you don’t use them, they can work in the background.
• 🔄 Reset the settings to factory (last option if nothing helps).

Also check if the phone is overheating.The Redmi 9 Pro is prone to trottling (automatic performance decline) in temperatures above 45°C. Use the AIDA64 or CPU Monitor app to track heating.

If the problem occurred after the MIUI update, try to roll back to the previous firmware version.

1. Download the desired version of MIUI from the official Xiaomi website.
2. Rename the file to update.zip and place it in the root folder of the phone.
3. Download to Recovery Mode and select Install update.zip.

💡

If your phone is slowing down after the MIUI update, don't rush to reset your settings. Try clearing the cache through Recovery first, which helps 70% of the time.

FAQ: Frequent questions about cleaning up cache on Redmi 9 Pro