Why the laptop is slow: all the reasons and solutions (2026)

Has your laptop suddenly started to think when opening tabs, programs take 10-20 seconds to launch, and the cursor jerks like it’s in slow motion? This doesn't always mean it's time to buy a new device. In 80% of cases, slow operation can be fixed on your own - without going to a service center and without losing data. The main thing is to correctly diagnose the cause.

We analyzed hundreds of user cases ASUS, Lenovo, HP, Acer And MacBook, as well as technical support data to highlight 10 most common causes of brakes. This article contains only working solutions tested on Windows 10/11, macOS Ventura/Sonoma and Linux (Ubuntu/Debian). No fluff - just specific instructions with screenshots (upon request) and warnings about common errors.

1. RAM overload: how to free up resources

The most common cause of brakes is lack of RAM. If you have 4-8 GB of RAM installed, and there are 20 Chrome tabs in the background, Discord, Telegram and a couple of “heavy” programs (such as Photoshop or AutoCAD), the system begins to actively use swap file. This is 10-50 times slower than working with RAM, so the laptop freezes.

How to check? On Windows open Task Manager (Ctrl+Shift+Esc) → “Performance” tab → “Memory”. If the number in the “Used” section is close to “Installed,” the memory is full. On macOS run "System Monitor" (Applications → Utilities) and look at the column Memory Pressure (if it is yellow/red - problems).

• 🔹 Close unnecessary programs: even collapsed Slack, Zoom or Steam can “eat up” 500 MB of RAM.
• 🔹 Disable startup: on Windows - in the same “Task Manager” (the “Startup” tab), on macOS - in “System Settings” → “General” → “Login Objects”.
• 🔹 Use lightweight alternatives: try instead of Chrome Microsoft Edge (it is optimized for Windows) or Firefox with extensions disabled.
• 🔹 Increase the swap file (if RAM ≤ 8 GB): Control Panel → System → Advanced system settings → Performance → Settings → Advanced → Virtual memory.

⚠️ Attention: If you see the process svchost.exe or msmpeng.exe with high RAM consumption is not a virus, but Windows system services (updates and defender). Do not kill them through the task manager - this may cause crashes!

2. Clogged disk: why an SSD can also slow down

Many people think that SSD drives do not need to be cleaned, but this is a myth. Yes, they work faster than HDD, but if there is less than 10% free space left on the disk, the read/write speed drops by 2-3 times. In addition, temporary files (Temp, browser cache, system logs) can take up tens of gigabytes.

How to check? On Windows, open This PC - if the drive C: highlighted in red, it's time to act. On macOS, go to About This Mac → Storage. Pay attention to the "System" and "Other" categories - they are often bloated with garbage.

Garbage type	Where to look (Windows)	Where to look (macOS)	How to clean
Temporary files	C:\Windows\Temp, C:\Users\Username\AppData\Local\Temp	/Library/Caches/, ~/Library/Caches/	Remove manually or via CCleaner/CleanMyMac
Browser cache	C:\Users\Username\AppData\Local\Google\Chrome\User Data\Default\Cache	~/Library/Caches/Google/Chrome/	Clear in browser settings or via chrome://settings/clearBrowserData
System logs	C:\Windows\Logs, C:\Windows\Panther	/var/log/, /Library/Logs/	Use Disk Cleanup (Windows) or OnyX (macOS)
Remnants of programs	C:\Program Files, C:\Users\Username\AppData\Roaming	/Library/Application Support/	Delete via Revo Uninstaller (Windows) or AppCleaner (macOS)

For deep cleaning on Windows, we recommend the command in CMD (on behalf of administrator):

cleanmgr /sagerun:1

On macOS, launch Terminal and enter:

sudo rm -rf ~/.Trash/*

⚠️ Attention: Don't delete folders System32 (Windows) or /System/ (macOS) - this will crash the system! Also, do not clear the cache of programs like Adobe or Microsoft Office manually - they may stop working.

3. Viruses and malware: how to detect and remove

If your laptop suddenly starts to slow down - especially after installing pirated software or visiting dubious sites - the first suspicion falls on viruses. Modern malware can masquerade as system processes (for example, lsass.exe or explorer.exe) and load the processor by 50-100%.

Signs of infection:

• 🛡️ The laptop “thinks” even during simple actions (opening a folder, launching a notepad).
• 🛡️ Unknown processes appear in the task manager (for example, winlogon.exe with high CPU consumption).
• 🛡️ The browser redirects to strange sites or shows unexpected advertisements.
• 🛡️ Antivirus is disabled or not updated.

How to check? Use several tools (one antivirus may miss the threat):

1. Windows Defender (built into Windows 10/11) - run a full scan via Windows Defender → Virus & Threat Protection → Scan Options → Full Scan.
2. Malwarebytes — the free version finds what classic antiviruses miss.
3. Kaspersky Virus Removal Tool or Dr.Web CureIt! — portable utilities for one-time scanning.

There are fewer viruses on macOS, but they do exist. Check the system via Avast Security or Bitdefender Virus Scanner. Pay attention to browser extensions - viruses are often disguised as them.

⚠️ Attention: Do not download “cleaners” like Advanced Mac Cleaner or PC Optimizer Pro - these are the viruses themselves! Use only proven tools from official websites.

What to do if the antivirus does not find threats, but the laptop is slow?

In this case, the virus could have infiltrated the boot sector or system files. Try:

1. Boot from LiveCD (for example, Kaspersky Rescue Disk) and scan the system.

2. Restore Windows via a rollback point (Control Panel → Recovery → Run System Restore).

3. On macOS - boot into Safe Mode (hold Shift when turned on) and check the activity of processes.

4. Overheating: why the laptop “suffocates” and how to fix it

A processor temperature above 90°C is a critical point at which any laptop will begin to throttle (reduce frequencies) to avoid damage. This leads to harsh brakes, even if everything was working fine before. Most often, overheating occurs due to:

• 🔥 Dusty cooling system (especially if the laptop is 3+ years old).
• 🔥 Dried thermal paste between the processor and the heatsink.
• 🔥 Working on soft surfaces (bed, sofa) blocking the ventilation holes.
• 🔥 Faulty cooler (the fan does not spin or spins intermittently).

How to check the temperature? Use programs:

• Windows: HWMonitor, Core Temp, Speccy.
• macOS: iStat Menus or Macs Fan Control.
• Linux: command sensors in the terminal (install the package lm-sensors).

Normal temperatures under load:

• Up to 70°C is optimal.
• 70-85°C is acceptable, but it is worth cleaning the laptop.
• 85-95°C is a critical zone, urgent intervention is required.
• Above 95°C - the laptop may turn off at any time.

Solutions:

1. Dust removal: Use a can of compressed air (not a vacuum cleaner!) to blow out the vents. For deep cleaning, disassemble the laptop (if you have experience) or contact service.
2. Replacing thermal paste: If the CPU temperature rises above 85°C during simple tasks (such as watching YouTube), the paste has dried out. Use quality ingredients: Arctic MX-6, Noctua NT-H2 or Thermal Grizzly Kryonaut.
3. Using a Cooling Pad: Suitable models with USB power (for example, Cooler Master NotePal X3 or Havit HV-F2056).
4. Fan settings: On Windows use Fan Control, on macOS - Macs Fan Control for manual control of cooler speed.

5. Disk fragmentation (for HDD) and file system errors

If your laptop has hard drive (HDD), and not an SSD, over time the files on it “split” into fragments. To read one document, the disk head has to “jump” across different sectors, which slows down the work by 5-10 times. On SSDs, fragmentation is not so critical, but file system errors can occur there too.

How to check fragmentation on Windows:

1. Open This computer, right click on the disk C: → Properties → Service → Optimize.
2. If the “Current Status” column shows more than 10% fragmentation, the disk needs to be defragmented.

On macOS, fragmentation is less relevant (thanks to HFS+/APFS), but file system errors are checked through:

diskutil verifyVolume /

Solutions:

• 💾 For HDD: run defragmentation (in the same “Optimize” menu). The process may take several hours - do not interrupt it!
• 💾 For SSD: defragmentation is not needed, but it is useful to run the command TRIM (optimizes drive operation):

fsutil behavior set DisableDeleteNotify 0

• 💾 Check the disk for errors: on Windows - chkdsk /f /r (in CMD from admin), on macOS - diskutil repairVolume /.

⚠️ Attention: Never defragment an SSD - this reduces its resource! For SSDs, it is enough to regularly run the command TRIM and monitor the free space (at least 15-20%).

6. Outdated software: drivers, BIOS and system

If you haven't updated in a while drivers, BIOS or the operating system itself, this may be the cause of the brakes. For example:

• 🖥️ Outdated video card driver (NVIDIA/AMD/Intel) leads to lags in games and videos.
• 🖥️ An older BIOS version may not properly manage processor power, causing it to not operate at full capacity.
• 🖥️ Unupdated Windows/macOS contains errors that slow down operation (especially true for Windows 10 version 1809 and older).

How to update:

1. Drivers:
   • Windows: use Driver Booster or official utilities (NVIDIA GeForce Experience, AMD Adrenalin, Intel Driver & Support Assistant).
   • macOS: Driver updates come through Software Update (System Settings → General → Software Update).
2. BIOS:
   • Download the latest version from the laptop manufacturer's website (for example, ASUS, Lenovo).
   • Update only through the official utility (for example, Lenovo Vantage, HP Support Assistant) or in the BIOS (optional EZ Flash at ASUS).
3. Operating system:
   • Windows: Settings → Update & Security → Windows Update.
   • macOS: System Settings → General → Software Update.

After updating the drivers, restart your laptop - some changes take effect only after a reboot.

7. Too many background processes and services

Even if you don't run "heavy" programs, there may be dozens of processes running in the background that eat CPU and RAM. For example:

• 🔄 Windows Services: Superfetch (aka SysMain), Windows Search, DiagTrack (telemetry collection).
• 🔄 Auto updates: Steam, Epic Games, NVIDIA GeForce Experience can download gigabytes of data in the background.
• 🔄 Cryptominers: Some websites and browser extensions use your CPU to mine cryptocurrency.

How to optimize:

• 🛠️ Disable unnecessary services:
  • Windows: Click Win + R, enter msconfig → “Services” tab. Uncheck unnecessary ones (for example, Xbox Live Auth Manager, if you don't play Xbox).
  • macOS: System Settings → General → Login Objects.
• 🛠️ Limit background activity:
  • On Windows 10/11: Settings → Privacy → Background apps - disable unnecessary ones.
  • In the browser: remove extensions you don't use (especially AdBlock, Grammar and other “heavy” addons).
• 🛠️ Check the task scheduler:
  • Windows: Start → Task Scheduler → remove tasks from third-party programs (for example, CCleaner, Avast).
  • macOS: Terminal → launchctl list (for advanced users).

For advanced users: In Windows, you can disable telemetry collection and unnecessary services through Group Policy Editor (gpedit.msc) or Registry Editor (regedit). On macOS use the command:

sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate AutomaticDownload -bool false

- this will disable automatic downloading of updates.

8. Hardware problems: when is it time to take your laptop to a service center?

If you have tried all the software methods, but the laptop is still slow, the problem may be gland. Here are the signs of hardware problems:

• 💥 Hard disk drive (HDD):
  • The laptop is frozen while loading the BIOS or Windows logo.
  • Clicking or grinding noises are heard from the case (this means that the disk is “crumbled”).
  • Files become damaged or disappear.
• 💥 Random access memory (RAM):
  • Blue screens of death (BSOD) with type errors MEMORY_MANAGEMENT or PAGE_FAULT_IN_NONPAGED_AREA.
  • The laptop randomly restarts or shuts down.
• 💥 CPU or motherboard:
  • The laptop does not turn on or turns on only once.
  • The cooler operates at maximum speed, but the temperature is still high.
• 💥 Video card:
  • Artifacts on the screen (stripes, squares, flickering).
  • Games or videos “scatter” into pixels.

How to diagnose:

1. HDD/SSD test:
   • Windows: CrystalDiskInfo (will show the disk status according to SMART).
   • macOS: diskutil verifyDisk /dev/disk0 (replace disk0 to your disk).
2. RAM test:
   • Windows: built-in utility mdsched.exe (search for “Memory Checker”).
   • macOS: MemTest86 (bootable USB drive).
3. CPU test:
   • Use Prime95 (Windows) or Geekbench (macOS) to check stability.

If the tests show errors, contact the service. In some cases it will help:

• Replacing HDD with SSD (even budget Kingston A400 or Crucial BX500 will speed up the laptop 3-5 times).
• Adding a RAM strip (for example, from 4 GB to 8 GB).
• Replacing thermal paste and cleaning from dust (if the problem is overheating).

⚠️ Attention: If the laptop is under warranty, do not open it yourself! This will void the warranty. Contact an authorized service center.

FAQ: Frequently asked questions about laptop brakes

❓ The laptop slows down only when connected to Wi-Fi. What's the matter?

Probable reasons:

1. Wi-Fi adapter driver: update it via Device Manager (Windows) or Software update (macOS).
2. Network congestion: If you have many devices connected to your router, limit the laptop's bandwidth in the router settings.
3. DNS server: try changing DNS to 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).
4. Virus: Some malware uses Internet traffic for mining or DDoS attacks.

Also check if the laptop gets hotter when connected to Wi-Fi - some adapters (for example, Intel AX200) may overheat.

❓ After updating Windows, the laptop began to slow down. How to roll back?

If the brakes started after a major update (for example, from Windows 10 to 11), try:

1. Roll back via restore point:
   • Windows: Start → Settings → Update and Security → Recovery → Reset your computer.
   • Select "Keep my files" (to avoid losing data).

If rolling back does not help, install the previous version of Windows from a flash drive (download the image from the official website Microsoft).

For macOS: use Time Machine to restore the system from a backup.

Important: Before rolling back, back up your important files to an external drive!

❓ The laptop slows down in games, although the hardware is powerful. What to do?

Reasons for lags in games:

• 🎮 CPU/GPU throttling due to overheating (see section 4).
• 🎮 Outdated drivers video cards (update via GeForce Experience or AMD Adrenalin).
• 🎮 Background processes: close Discord, Steam, browser and other programs via Task Manager.
• 🎮 Lack of RAM: if you have 8 GB of RAM, and the game requires 12+, try to close all unnecessary ones or add a RAM bar.
• 🎮 Graphics Settings: Lower resolution, disable anti-aliasing and shadows, limit FPS to 60.
• 🎮 Virus or miner: check the system via Malwarebytes.

Also try:

• Install the game on the SSD (if it is on the HDD).
• Disable NVIDIA GeForce Experience Overlay (it may conflict with games).
• In the power settings, select the “High performance” plan.

❓ Is it possible to speed up an old laptop (for example, with 2 G