Xiaomi Redmi Note 9 laptop slows down – what to do in 2026?

Xiaomi Redmi Note laptop 9 (or its modifications RedmiBook 14/15/16) — It's a popular solution for their money, but over time, many users experience slowdowns, and the system gets "thought" when you open apps, the video is lagging, and sometimes even the cursor freezes for a few seconds. The reasons can be both software failures and hardware limitations — especially if you’re actively using your laptop for work or gaming.

In this article, we'll look at all the possible causes of brakes, from cache clogged to drive wear, and give you step-by-step instructions for elimination. Importantly, some methods require basic PC skills, but most solutions can be done even by a beginner. Let's start with simple ways and gradually move on to more complex ones.

If your Redmi Note 9 is slowing down suddenly (for example, after updating Windows or installing a new program), it is likely a software problem. If the slowdowns are gradually increasing, it is the hardware or wear of the system.

1.Diagnostics: why the brakes Xiaomi laptop

Before you start treatment, you need to pinpoint the source of the problem, and brakes can manifest themselves in different ways:

• 🐢 Slow System Startup – Windows is loading 5+ minute.
• 🖱️ Lags of the cursor / keyboard - delays when entering or moving the mouse.
• 🎮 Freezes in games / video - hanging when watching or in 3D-annexes.
• 🔥 Overheating and trottling – the laptop is very warm and reduces productivity.

Use the built-in Windows tools to diagnose:

1. Press Ctrl. + Shift + Esc to open Task Manager.
2. Go to the Performance tab and check the boot: CPU (processor): if the load is constantly 90-100% - a problem in the background or viruses. RAM: if busy >80% is missing RAM. Disk: 100% download – the drive is worn out or overloaded.

If you see a resource-eating process in Task Manager (like svchost.exe or Microsoft Edge), write down the name, which will help thelater. You can use utilities like HWiNFO or CrystalDiskInfo for deep diagnostics. SSD/HDD).

System Cleanup: Remove garbage and unnecessary programs

The most common cause of brakes is a clogged system, with time-storage files, cache, remnants of deleted programs and duplicates accumulating over time, and this is especially critical on the Redmi Note 9, with its modest 8-16 GB of RAM.

Step 1. Clean the disk with built-in means:

1. Open the Start. → Parameters → System system → Memory.
2. Click Clean Now under the Disk Cleanup section.
3. Select the C drive: and mark all items (especially Temporary Files, Recycle Bin, Downloads).

Delete temporary files through "Settings"|Clear the browser cache (Chrome, Edge)|Remove unused programs|Check autoload.|Clean the basket.-->

Step 3: Cleaning up the boot:

Many programs are added to the boot and slow down the system start-up, to turn them off:

1. Open Task Manager. → Autoboot.
2. Disable all programs except antivirus and drivers (e.g., antivirus, NVIDIA or Realtek Audio).

⚠️ Warning: Do not disable system processes with the names svchost.exe, winlogon.exe or lsass.exe – this can lead to the collapse of Windows.

3. Windows Optimization for Weak Iron

Redmi Note 9 Often completed with Intel Core processors i3/i5 10-generation or AMD Ryzen 5 3500U, which are not very productive. - Windows 11/10 default set to maximum performance, but for weak laptops it only hurts.

Disabling visual effects:

1. Press Win. + R, enter sysdm.cpl and go to the tab Additional.
2. In the Speed section, click the Settings.
3. Choose to provide the best performance and save.

Set up the power supply plan:

Windows uses a balanced mode by default, but for the Redmi Note 9, it’s better to choose High Performance (despite the name, this will reduce lags):

1. Open the control panel. → Power supply.
2. Choose the High Performance scheme.
3. Click on the Power Scheme Setup → Modify additional parameters.
4. Set the minimum CPU state to 100% (this will prevent trottling).

Disconnection of unnecessary services:

Some Windows services can be safely disabled to free up resources:

sc config DiagTrack start= disabled


sc config dmwappushservice start= disabled




sc config WSearch start= disabled

These commands will disable telemetry, app updates, and file indexing (unless you use Windows search).

💡

If errors occur after the services are disabled, return them to the original state by the command sc config Name Services start.= auto.

4. Problems with the drive: SSD vs HDD

Redmi Note 9 can be completed as a SSD (fast storage, and HDD (It's a slow hard drive. HDD, brakes are almost inevitable – especially when working with large files or multiple programs at the same time.

How to check the type of storage:

1. Open Task Manager. → Productivity → Disc.
2. If it says in the top corner SSD — You have a solid state drive. HDD — hard-drive.

What to do if it slows down HDD:

• 🔧 Defragmentation: Open Disk Optimization (find through search) and start defragmentation for C disk:.
• 🛠️ Error Check: Enter in the command line (Win) + R → cmd): chkdsk C: /f /r and restart the laptop.
• 💾 Replacement SSD: If the budget allows, the replacement HDD on SSD This gives you a speed increase of 3-5 times – this is the most effective solution for old laptops.

Problems with SSD:

Even SSD It loses speed over time due to wear and tear of the cells. Check its condition with CrystalDiskInfo:

• 🟢 Good, it's all right.
• 🟡 Anxiety (Caution) - the drive is worn out, the speed drops.
• 🔴 Bad – Get backup immediately and get ready to be replaced.

5. Overheating and trottling: how to cool a laptop

The Redmi Note 9 is known for cooling issues - especially if you play or render video.When overheated, the processor automatically reduces the frequency (trottling), leading to sharp lags.

How to check the temperature:

Use HWiNFO or Core Temp. Normal values:

• 🟢 Up to 70.°C - normal.
• 🟡 70–85°C - trottling begins.
• 🔴 Above 90.°C - critical temperature, laptop may turn off.

How to lower the temperature:

1. Dust cleanup: Take your laptop apart (or take it to the service) and blow the fan with compressed air. On the Redmi Note 9, dust accumulates especially quickly due to the compact body.
2. Thermopaste replacement: If the laptop is older than 2 years, the thermopaste may have dried. Use quality formulations (Arctic) MX-6, Noctua NT-H2).
3. Use the stand: Buy a cooling stand with USB-food - this will reduce the temperature by 5-10°C.
4. Fan setup: Set up Fan Control and set a more aggressive cooling profile.

⚠️ Warning: If you've never taken a laptop apart, you'd better leave it to a service center to clean it up.

6. Viruses and malware

One of the most insidious causes of brakes is viruses and mining software, which can run in the background, eating up to 100% of the CPU or graphics card, and this is especially common if you download programs from torrents or do not update antivirus.

How to check the system for viruses:

1. Download Kaspersky Virus Removal Tool or Dr.Web CureIt! (they don't require installation).
2. Run a full check (may take 1-2 hours).
3. Remove all threats and restart your laptop.

How to remove miners and spyware:

Some viruses disguise themselves as system processes, and if the antivirus doesn't find anything, the CPU is still 100 percent loaded.

1. Open Task Manager and sort the CPU loading processes.
2. If you see suspicious names (such as svchost.exe with a high load or WindowsHostManager), write them down and check them through Google.
3. Use AdwCleaner or Malwarebytes to remove.

How to protect yourself in the future:

• 🔒 Install Bitdefender or ESET NOD32 (They are less loaded than Kaspersky).
• 🚫 Do not install programs from unknown sites (especially "crackers" and repacs).
• 🔄 Update Windows and drivers regularly.

💡

If the brakes are left after the viruses are removed, check the hosts file (path: C:\Windows\System32\drivers\etc\hosts). Sometimes viruses prescribe redirects that slow down the network.

7.Iron upgrade: what can be improved in the Redmi Note 9

If all software methods are tried, but the laptop still brakes, the upgrade of the iron remains. Redmi Note 9 allows you to replace:

• 🖥️ RAM – up to a maximum of 32 GB DDR4 (Check compatibility with your model).
• 💾 The storage device, replace it. HDD on SSD (Like Kingston. NV2 or Crucial P3).
• 🔋 Battery – if the laptop turns off when disconnected from the network, the battery is worn out.

How to choose SSD For the Redmi Note 9:

How to replace the memory:

Redmi Note 9 usually has one slot for the RAM (To add memory, sometimes two:

1. Buy the bar with the same frequency as the one installed (for example, DDR4-2666).
2. Turn off the laptop, remove the back cover and insert a new bar into the free slot.
3. If there are no slots, replace the old bar with a more capacious one (for example, from 8 GB to 16 GB).

⚠️ Attention: Before buying RAM Check the maximum supported volume on the Xiaomi website or through the utility CPU-Z (tab SPD). Some Redmi Note 9 models don’t support more than 16GB.

8. Windows reset or system reinstallation

If nothing works, the last chance is to completely reset or reinstall Windows. It's a radical method, but it's guaranteed to remove all software problems.

Option 1: Reset with saving files:

1. Open Options → Update and Security → Recovery.
2. Click Start under Return the computer to its original state.
3. Select Save My Files (programs will be deleted, but documents will remain).

Option 2: Clean Windows installation:

You will need a flash drive with Windows 10/11 (You can create it through the Media Creation Tool):

1. Boot from the flash drive (click on) F12 or Del when turned on to select the boot device).
2. When installing, select Selective Installation and format the C: drive.
3. After installation, install drivers from the Xiaomi site (especially for graphics card, Wi-Fi and touchpad).

What to do after the reinstallation:

• 🔧 Install drivers manually (automatic installation via Windows Update may miss critical drivers).
• 🛡️ Install the antivirus immediately and disable telemetry (Settings) → Confidentiality → Diagnostics).
• 📁 Restore files from backup (if you did backup).

💡

After reinstalling Windows, your laptop will run faster, but remember to clean the system every six months (see section 2).

FAQ: Frequent questions about the Redmi Note 9 brakes