12 Reasons Why Xiaomi Redmi Is a Freelance 9C Stopping and laying – how to eliminate in 10 minutes

Xiaomi Redmi 9C

MediaTek Helio G35

80% of the time the problem is solved without repair.

In this article, we'll look at all the possible causes of brakes, from a simple memory deficit to hidden firmware errors, how to diagnose a problem by symptoms, what apps are eating up resources, and what to do if the phone starts to "glut" after the update. Spoiler: 90% of the time, it's not the device itself that's to blame, but the software.

First, determine when exactly the lags occur:

• 🔥 When launching specific applications (games, social networks, camera)?
• ⚡ After charging or at low battery level?
• 📱 When switching between tasks or scrolling through the menu?
• 🔄 After updating MIUI?

The answer to this question will narrow down the possible causes of 12 before 2-3.

1. Overloading of RAM (RAM)

Redmi 9C fitted 2-3 GB of RAM — that's enough for basic tasks, but modern applications (especially games and social networks) are actively consuming memory. 300 MB, the system begins to "hang", killing background processes.

How to check:

1. Open the settings → About the phone → Memory
2. See the schedule of RAM use in the section "Memory Use"
3. If you have less than 500 MB, it’s time to clean.

Top.-5 "memory eaters" on Redmi 9C:

• 🎮 Games (Free Fire, PUBG Mobile, Genshin Impact – up to 1.2 GB each
• 📷 Camera Apps with Effects (Snapchat, B612) — 800 MB
• 📱 Nova Launcher (Microsoft Launcher) – up to 400 MB
• 🎵 Music services (Spotify, Yandex Music) – up to 300 MB when caching
• 🔍 Background services (Google Play Services, MIUI Optimization – up to 500 MB

⚠️ Note: Do not use memory boosters from the Play Market! DU Speed Booster consumes resources themselves and often contains advertising software. Instead, enable built-in optimization. MIUI: Settings → Annexes → Optimization.

Close all background applications (swipe up in the multitasking menu)

Disable auto-run of unnecessary applications in Settings → Annexes → Autostart control

Clean the cache in Settings → Storage → Cleanup

Reboot your phone (hold the power button for 10 seconds)

Remove unused apps (especially games)

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2.Clattered internal storage

When your internal memory is more than 85%, The system starts to slow down due to file fragmentation.Redmi 9C has 32/64 GB of memory, but is available to the user 5-7 GB is less (due to system files and MIUI).

Critical filling thresholds:

How to make room:

1. Transfer the photo and video to SD-map (up to 512 GB) or to the cloud (Google Photo, MI Cloud)
2. Remove the app cache: Settings → Warehouse → Cleanup → Cash app.
3. Use the built-in storage analyzer: Settings → Warehouse → Analysis of the vault
4. Remove duplicate files using Files by Google or MI File Manager

💡

Enable the function "Light mode" in Settings → Special facilities → Light mode, it'll turn off heavy animations. MIUI and speed up the work on 15-20%.

3. Processor overheating

MediaTek Helio G35 redmi 9C It's prone to overheating at high loads.°C, the system automatically reduces performance (trottling), which causes lags:

• 🎮 Long-term gaming sessions (more than 30 minutes)
• 📹 Video recording in 1080p
• 🔋 Fast charging with active use
• 🌡️ Direct sunlight or high ambient temperature
• 🛠️ Clogged charging connector or vents

How to check the temperature:

1. Install the app AIDA64 or CPU Monitor
2. Run a performance test
3. Check the temperature in the "Sensors" section.

Normal readings:

• 🟢 45.°C = optimum temperature
• 🟡 45-60°C - permissible under load
• 🔴 60-70°C - Critical Zone, Trottling begins
• 🚨 Above 70.°C – Refrigerate the device immediately!

⚠️ Warning: If the phone is heated above 60°C in standby mode (no running applications), this is a sign of a malfunction of the battery or thermal paste, in which case a diagnosis is required at the service center.

4. Obsolete or "curved" firmware

MIUI It's known for its frequent updates, but not all of them are optimized for budget models. MIUI 12.5/13 Many Redmi users 9C complained about the lags:

How to check the firmware version:

1. Go to Settings → About the phone → MIUI version
2. Compare the latest stable versions on Xiaomi's official website

Stable versions for Redmi 9C (2026):

What to do if the lags appeared after the update:

• 🔄 Reverse to the previous version through Settings → The phone. → Updating the system → Threefold → Select a Service Package
• 🧹 Cache reset (does not delete data!): Turn off your phone → clamp down on power. + Loudness up → Choose the Wipe Cache
• 📥 Install custom restoration (TWRP) and run an optimized firmware (e.g., Xiaomi.eu)

💡

If after the update the phone began to slow down, first try to reset the settings to the factory (Settings) → Additionally. → Recovery and reset: 60 percent of the time, this solves the problem without rolling back the firmware.

5. Viruses and malware

Redmi 9C It is often a target for viruses because of:

• 📱 Install applications from unknown sources (Settings) → Confidentiality → Special permits → Installation of unknown applications)
• 🔗 Transferring suspicious links to SMS/messenger
• 🎮 Pirate Games and “Hacked” Applications

Signs of infection:

• 🚀 Increased traffic consumption (check in Settings) → SIM cards and mobile networks → Using traffic)
• 🔋 Fast battery discharge in standby mode
• 📱 Appearance of unfamiliar apps on the menu
• 💰 Write-offs from the account (SMS short-numbered)

How to check and remove viruses:

1. Install Malwarebytes or Dr.Web Light from Play Market
2. Start a full scan (it will take you) 10-15 minute)
3. Remove all threats detected
4. Check the list of installed applications for suspicious (Settings) → Annexes → Application management)

⚠️ Warning: Some viruses masquerade as system applications (e.g. com.android.system). If you're not sure, don't delete anything manually.

6.Battery problems

A worn-out battery not only discharges quickly, but also causes system lags.When voltage drops below a critical level, the processor automatically reduces performance.Normal wear for Redmi 9C (2020 release):

• 🟢 Up to 20% wear – battery as new
• 🟡 20-40% — There is a marked reduction in working hours
• 🔴 40-60% — They start to hang at low charge.
• 🚨 Over 60% – Replacement of battery required

How to check the status of the battery:

1. Install AccuBattery or Battery Guru
2. Run a battery health test
3. Look at the capacity (should be close to 5000 mAh)

If the capacity has fallen below 3000 mAh:

• 🔋 At low charge (less than) 20%) The phone will slow down - keep the charge at level 30-80%
• 🔌 Avoid fast charging – it accelerates degradation
• 🛠️ Contact the service for battery replacement (cost) ~1500-2000 ruble.)

💡

Enable energy saving mode in Settings → Battery → Energy saving mode. This will limit background activity and increase the operating time of the 20-30%, But it'll slow down productivity.

7. Application and service conflicts

Some applications are in conflict with MIUI, It's a common culprit:

• 📱 Lonchers (Nova, Apex, Microsoft Launcher)
• 🔒 Antiviruses (Avast, Kaspersky, 360 Security)
• 🎵 Musical widgets (Poweramp, JetAudio)
• 📊 Optimizers (CCleaner, SD Maid)

How to find a problem application:

1. Start your phone in Safe Mode (hold the shutdown button → Safe Mode)
2. If the lags are missing, one of the installed applications is to blame.
3. Remove suspicious programs by checking performance

List of known conflicts for Redmi 9C:

FAQ: Frequent questions about Redmi 9C brakes