Why is my laptop running very slowly and how to fix it?

Does your laptop take forever to boot, programs take 5 minutes to open, and the cursor freezes at the slightest load? Slow performance is one of the most common problems that users encounter after 2-3 years of use. But don’t rush to run to a service center: in 80% of cases, the cause can be eliminated yourself without spending money on diagnostics.

In this article we will analyze all possible causes of brakes - from a clogged cache to a worn-out hard drive, and we’ll also give step by step instructions to speed up a laptop Windows 10/11 And macOS. We will pay special attention hidden power consumption settings that manufacturers often keep silent in the documentation.

1. Overheating: why the laptop “chokes” itself

The first and most insidious reason for brakes is overheating of the processor or video card. At temperatures above 85°C, modern chips automatically reduce performance (thermal throttling) to avoid damage. As a result, the laptop begins to lag even during simple tasks, for example, when opening a browser.

How to check the temperature? Use the utilities:

• 🔥 HWMonitor (Windows) - Shows the temperature of all components in real time
• 🌡️ Macs Fan Control (macOS) - monitors sensors and allows you to manually adjust fan speeds
• 📊 Core Temp — specializes in processor core temperature

Normal values:

- During idle time: 40–50°C

- Under load: 70–80°C (maximum 85°C)

- Critical zone: above 90°C - requires urgent action

⚠️ Attention: If the processor temperature jumps from 60°C to 95°C in seconds, this is a sign dried thermal paste or a faulty cooler. In this case, cleaning and replacing the paste is mandatory!

What to do?

Run the laptop on a flat, hard surface (not on a bed/blanket)|

Disable turbo mode in BIOS ("CPU Turbo Boost" option)|

Place your laptop on a cooling pad with USB fans|

Blow dust out of the ventilation grilles with a can of compressed air.

-->

2. Clogged hard drive (HDD) or full SSD

If you have HDD (not SSD), then when the capacity is more than 90% full, the read/write speed drops by 3–5 times. Even a simple operation - opening a folder - can take several seconds. U SSD the problem is different: if there is not enough free space (less than 10–15%), the mechanism turns on garbage collection, which slows down the system.

How to check:

1. On Windows: open This computer → right click on the disk C: → Properties.
2. On macOS: About This Mac → Storage.

Disk type	Critical fill threshold	Recommended free space
HDD	>90%	15–20% of volume
SSD	>85%	10–15% of volume
eMMC (in budget laptops)	>80%	20% of volume

How to free up space:

• 🗑️ Delete temporary files via Disk Cleanup (Windows) or Storage optimization (macOS).
• 🎮 Transfer games and heavy programs to an external drive.
• 📁 Archive old files to the cloud (Google Drive, Yandex Disk).
• 🔍 Use WinDirStat (Windows) or GrandPerspective (macOS) to search for junk files.

3. Startup: why the laptop slows down when turned on

Every time you start Windows or macOS, dozens of programs are automatically loaded - instant messengers, drivers, background services. The more there are, the longer the download and the slower the system. For example, NVIDIA GeForce Experience or Adobe Creative Cloud can “eat up” up to 30% of the CPU in the background.

How to check startup:

• 🪟 Windows: Ctrl+Shift+Esc → Task Manager → Startup.
• 🍎 macOS: System Preferences → Users and Groups → Login Items.

What can be disabled without risk:

List of programs that are safe to disable

- CCleaner (unless you use its monitoring features)

- Steam Client Bootstrapper (if you don't play daily)

- Epic Games Launcher

- Microsoft OneDrive (if you don't use the cloud)

- Java Update Scheduler

- Any programs with the word "Helper" or "Agent" in the name (for example, Adobe GC Invoker)

After disabling unnecessary elements, restart your laptop and note the boot time. If the difference is noticeable, the problem was with startup.

System Boot|

Browser operation|

Launching games/programs|

Working with files (copying, opening)

-->

4. Viruses and malware: hidden “brakes”

Malware doesn't always steal data; often it just absorbs resources laptop. For example, mining viruses use up to 100% CPU to mine cryptocurrency, and adware loads the processor with advertising banners. Signs of infection:

• 🛑 The laptop slows down even when idle (the CPU is loaded at 30-50% for no apparent reason).
• 🔄 Unfamiliar processes appear in Task Manager (For example, svchost.exe with high load).
• 🌐 The browser redirects to strange sites or shows pop-ups.

How to check:

1. Open Task Manager (Ctrl+Shift+Esc) → sort processes by CPU load.
2. Check the list of installed programs in Control Panel → Programs and Features.
3. Use Process Explorer (from Microsoft) for detailed process analysis.

How to treat:

• 🛡️ Perform a scan Malwarebytes (free version).
• 🔍 Use AdwCleaner to remove adware.
• 🔄 Reset browsers to factory settings (in Chrome: Settings → Reset settings).

⚠️ Attention: Some viruses disguise themselves as system processes (for example, lsass.exe). If you are not sure, do not delete the process manually! Better take advantage Kaspersky Virus Removal Tool.

5. Lack of random access memory (RAM)

If you have 4 GB of RAM or less, modern programs (Chrome, Photoshop, Visual Studio) will slow down even with 2-3 open tabs. Signs of low RAM:

• 🖥️ The laptop freezes when switching between windows.
• 💾 The hard drive is constantly “cracking” (the system uses swap file).
• 📉 B Task Manager Memory is 90%+ loaded.

How to check:

1. On Windows: Ctrl+Shift+Esc → Memory.
2. On macOS: System Monitoring → Memory.

Solutions:

• 🔄 Close unnecessary programs (especially browsers - one tab Chrome “eats” 500–1000 MB of RAM).
• 🔧 Increase the swap file: Control Panel → System → Advanced Settings → Performance → Advanced → Virtual Memory.
• 💻 Add RAM (if there are free slots). For office work, 8 GB is enough, for games/editing - 16 GB.

6. Outdated or damaged operating system

If you haven't updated Windows or macOS for years, the system accumulates errors that slow down your work. For example, damaged system files may cause delays when opening the Start menu or launching programs. On macOS an outdated version may conflict with new applications.

How to check system integrity:

• 🪟 Windows: Run Command Prompt as Administrator and type:

  sfc /scannow
  dism /online /cleanup-image /restorehealth

• 🍎 macOS: execute First aid in Disk Utility.

If the system is damaged, it will help:

• 🔄 Update to the latest version (for example, from Windows 10 to 11).
• 📥 Clean OS installation (with saving files).
• 🔧 Rollback to a restore point (if the brakes started after installing the program).

On Windows It's also worth turning off visual effects:

1. Go to Control Panel → System → Advanced system settings → Performance → Settings.
2. Select Provide better performance.

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

If all software methods have been tried, but the laptop still slows down, the problem may be gland:

• 💾 Worn out HDD/SSD: check disk health using CrystalDiskInfo (parameter Reallocated Sectors Count should not be yellow/red).
• 🔋 Swollen battery: If the battery is swollen, it can put pressure on the motherboard, causing failures.
• 🔌 Faulty RAM: test RAM with program MemTest86.
• 🔧 Thermal paste falling off: If the laptop overheats and turns off, the paste needs to be replaced.

Signs of critical wear of iron:

Component	Symptoms	Solution
HDD/SSD	Constant freezes, reading errors, blue screen (CRITICAL_PROCESS_DIED)	Replacing the drive
RAM	Program crashes, screen artifacts, errors MEMORY_MANAGEMENT	Replacing the RAM stick
Battery	The laptop works only from the network, suddenly turns off	Battery replacement

⚠️ Attention: If CrystalDiskInfo shows disk status Pred Fail (pre-failure), backup your data immediately — the disk can fail at any moment!

8. Optimization for games and heavy programs

If the laptop slows down in games (GTA V, Cyberpunk 2077) or editing programs (Adobe Premiere, Blender), try:

• 🎮 Install game mode on Windows: Settings → Games → Game Mode.
• 🔧 Optimize graphics settings:
  NVIDIA Settings to Increase FPS

  Open NVIDIA Control Panel → Managing 3D Settings → set:

  - Maximum number of pre-rendered frames: 1

  - Streaming Optimization Technology: On

  - VSync: Off

• 🖥️ Use Process Lasso to prioritize game processes.
• 🔌 Connect your laptop to the network (do not run on battery) - this removes performance limitations.

For macOS:

• 🍎 Disable transparency and animation in System Preferences → Accessibility → Monitor → Reduce Transparency.
• 🔋 Turn on the mode High performance in Energy saving.

FAQ: Frequently asked questions about laptop brakes

❓ The laptop slows down after updating Windows. What to do?

If the brakes started after the update, try:

1. Roll back to the previous version: Settings → Update & Security → Recovery → Go back to a previous version of Windows.
2. Remove the problematic update: Control Panel → Programs → View installed updates.
3. Reset the update cache: stop the service Windows Update and delete the folder C:\Windows\SoftwareDistribution\Download.

❓ Why does my laptop slow down when connected to Wi-Fi?

Possible reasons:

• The Wi-Fi adapter driver is out of date (update via Device Manager).
• The laptop downloads updates in the background (check Windows Update).
• Virus uses your Wi-Fi for DDoS attacks (scan your system Malwarebytes).

Solution: Disable automatic downloading of updates or limit internet speed for background activity.

❓ Is it possible to speed up an old laptop with 2 GB of RAM?

Yes, but with restrictions:

• Install Windows 10 LTSC or Linux Xubuntu - they consume less resources.
• Replace HDD with SSD (even budget Kingston A400 will speed up loading by 5 times).
• Use easy program analogues: LibreOffice instead of Microsoft Office, Paint.NET instead of Photoshop.

If your budget allows, add another 2–4 GB of RAM (the maximum for most older laptops is 8 GB).

❓ Why does the laptop slow down after replacing the thermal paste?

Possible errors:

• The paste layer is too thick (should be ~0.5 mm).
• The cooler is not securely fastened (check the fastenings).
• Poor quality paste used (take Arctic MX-6 or Noctua NT-H2).
• Dust has not been removed from the radiator (blow with compressed air).

Recheck the cooler installation and repeat the overheating test.

❓ How to check if your laptop is slowing down due to antivirus?

Some antiviruses (Kaspersky, Norton) heavily load the system. To check:

1. Open Task Manager and look at the load from the antivirus software.
2. Temporarily disable protection and check performance.
3. Replace with a light antivirus: Bitdefender (Game mode) or built-in Windows Defender.