How to speed up Xiaomi Redmi 9C: from system cleaning to deep optimization

Why the Redmi 9C is slowing down and what to do about it

Smartphone Xiaomi Redmi 9C with a processor Helio G35 and 2-3 GB of RAM initially does not belong to the flagships, but even modest iron should work smoothly. If your device began to “stutter” when scrolling through the menu, open applications for a long time or suddenly overheat – the problem is not the “weakness” of the model, and in a polluted system, incorrect settings or worn-out battery.

According to AnTuTu tests, a clean Redmi 9C on MIUI 14 scores up to 100,000 to 120, but after a year of use, it could drop by 30 to 50 percent, due to background processes, cache, outdated firmware or viruses. The good news is that 90 percent of performance problems are solved software-free without replacing components. In this article, only proven methods that actually work on the Redmi 9C in 2026.

Before you start optimizing, answer two questions:

• 🔋 If you’ve been over a year, make a hard reset first).
• 📱 How much free memory? Less than 10GB - delete unnecessary files or transfer them to a memory card.

1.Cache and garbage cleanup: a quick way to get speed back

App cache and system debris are the main “brakes” for budget smartphones. On the Redmi 9C with 32 GB of memory, even 5-7 GB of “clutter” can reduce performance by 20-30%. You need to clean the cache every 1-2 weeks, rather than waiting for the phone to start “dulling”.

Cleaning methods:

• 🧹 Built-in utility MIUI: Go to Settings. → Annexes → Clean up and click "Clean" Remove up to 1-3 GB of unnecessary files.
• 🗑️ Manual cache cleanup: in the same App menu, select heavy programs (e.g. Facebook, Instagram) and click Clear cache».
• 🛠️ Third-party utilities: CCleaner or SD Maid will find the trash that MIUI not seeing (for example, remnants of remote applications).

Do not clear the system application cache (Mi Account, Security) – this can cause MIUI to malfunction.

2. Disconnect background processes and autoboot

Redmi 9C with 2GB of RAM is critical to background processes, even closed applications can "hang" in memory, eating up to 30-40% of resources.

1. Open Settings → Applications → Application Management.
2. Select an app (such as TikTok) and go to AutoStart.
3. Turn off background activity permissions and autostart.

For radical optimization, use the developer mode:

1. Activate it: Settings → About Phone → MIUI version (click 7 times).
2. Back to Settings → Additionally. → For developers.
3. Set a limit for background processes: No more than 2 processes.

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If after turning off the autoboot, notifications from messengers stopped coming, add them to the exceptions in the battery settings (Settings → Battery → Battery Optimization).

3. MIUI Optimization: Hidden Settings for Acceleration

The MIUI firmware on Redmi 9C has hidden features that can speed up the system, such as interface animations eating up to 10 to 15 percent of the performance to turn them off:

Settings → The phone. → Version. MIUI (7 times)


Settings → Additional → For developers → The scale of the animation window: 0.5x




Transition animation scale: 0.5x




The duration of the animator: 0.5x

Another lifehack is to disable MIUI Optimization (does not work on all firmware versions):

Settings → Additional → For developers → Disable MIUI Optimization

After disabling MIUI optimization, the smartphone can reboot and some functions (such as gestures) will reset to standard. This is normal – performance will increase by 15-20%.

4.Firmware and kernel updates: when it really helps

Xiaomi regularly releases updates for the Redmi 9C, but not all of them are optimized for weak iron. For example, switching from MIUI 12 to MIUI 14 can both speed up and slow down a smartphone. Check the current version in Settings → About the phone.

Rules of update:

• ✅ Update if the current version is older than 6 months.
• ❌ Don’t install beta versions – they often contain bugs.
• ⚠️ Before updating, make a backup: Settings → System system → Backup.

If after the update, the smartphone began to slow down more, reset the cache:

1. Turn off the phone.
2. Press Power + Volume up until the Mi logo appears.
3. Select Wipe Cache Partition (Change – Volume buttons).

5. Transfer applications to memory card: unloading internal memory

The 32GB internal memory of the Redmi 9C fills up very quickly, especially if you install games. When it's less than 3 to 5GB free, the system starts to slow down. The solution is to move some applications to microSD (cards up to 512GB are supported).

How to move:

1. Insert a memory card (FAT32 or exFAT format).
2. Go to Settings → Applications.
3. Select an app (such as Spotify) and click “Move to” SD-map».

Attention! Not all applications support portability, for example, WhatsApp and Banking applications will remain in internal memory, and after transfer, some programs may run slower (depending on class). SD-map).

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For games and heavy applications, use A2 or UHS-I memory cards, which are 2-3 times faster than standard ones.

6.Reset to factory settings: Last chance to get speed back

If nothing works, then you have to reset your phone completely to factory settings, which will delete all the data, but return the Redmi 9C to its original state, and according to 4PDA forum users, resetting increases performance by 40-60%.

How to reset:

1. Save important data (photos, contacts) to your PC or cloud.
2. Go to Settings → System → Resetting settings.
3. Select “Delete all data” and confirm.

After discharge:

• 🔄 Do not restore data from a backup copy – it may contain “junk».
• 📱 Install applications gradually, checking performance.
• ⚡ Turn off automatic app updates on Google Play.

Attention! On Redmi 9C with bootloader unlocked, a reset may result in a device being locked. If you previously unlocked it for custom firmware installation, link your Mi Account before resetting.

7. Hardware causes of brakes: when it's time to carry in service

If the software methods did not help, the problem may be in the hardware:

• 🔋 Worn-out battery (capacity below 70%) – leads to sudden shutdowns and brakes.
• 🔥 CPU overheating - check the temperature in the app AIDA64 (normal: up to 45°C to the plain).
• 💾 Damaged flash memory – if the phone is “hung” on the Mi logo, it is a sign of failure EMMC.

Diagnosis:

1. Check the state of the battery in Settings → Battery → Battery condition.
2. Install the CPU Monitor to monitor the load on the processor.
3. If the phone turns off at 20-30% charge, change the battery.

The cost of repairs in 2026:

FAQ: Frequent questions about Redmi 9C acceleration