Has your laptop suddenly started “thinking” about every click, programs take minutes to open, and the cursor freezes on the screen? This is not just an irritation - a signal that the system requires urgent intervention. Slowdowns can be caused by both software glitches and hardware problems. In this article we will analyze all possible reasons - from a full disk to processor overheating - and we’ll give concrete solutions, tested on laptops ASUS, Lenovo, HP And MacBook.

Don’t rush to take your device to a service center: in 80% of cases, the problem can be fixed on your own in 10–30 minutes. We have collected current methods for Windows 10/11, macOS Ventura/Sonoma And Linux (Ubuntu, Mint), and we’ll also tell you when it’s really time to contact a specialist. Let's start with the most common reason...

1. Disk full: why 90% of users ignore warnings

If on the system disk (C: on Windows or / in Linux/macOS) less than 10–15% of free space remains, the laptop begins to slow down due to file fragmentation and lack of space for temporary data. This is especially critical for SSD drives: when more than 85% full, their speed drops by 2–3 times.

How to check:

  • 🖥️ Windows: Open This computer → right click on the drive C: → Properties. If less than 20 GB is free, the problem has been found.
  • 🍎 macOS: Go to About This Mac → Storage. A red or orange stripe is a signal to action.
  • 🐧 Linux: In the terminal, enter df -h and check the column Use% for the root partition.

Solutions (from simple to complex):

  1. Delete temporary files:
    • 🧹 On Windows: Win + R → enter %temp% → delete everything from the folder.
    • 🗑️ On macOS: Open Finder → Go → Go to Folder → enter ~/Library/Caches.
  2. Use built-in cleaning tools:
    • 🔧 Windows: Settings → System → Device storage → Clear recommendations.
    • 🍏 macOS: About This Mac → Storage → Manage → Optimize Storage.
  • Transfer large files (videos, games, archives) to an external drive or to the cloud. Even freeing up 10–15 GB can restore performance.
    • ⚠️ Attention: Do not delete files from folders System32 (Windows) or /System (macOS) manually! This will lead to the collapse of the system.
    📊 How often do you clean your disk of unnecessary files?
    • Once a week
    • Once a month
    • Only when the laptop starts to slow down
    • Never

    2. Overheating: how temperature kills performance

    Laptops with higher CPU temperatures 85°C automatically troll (reduce frequency) to protect against damage. This leads to sudden stuttering, especially in games or when rendering. Models with thin bodies overheat most often: MacBook Air, Dell XPS 13, HP Spectre.

    Signs of overheating:

    • 🔥 Hot housing in the area of ventilation grilles.
    • 💨 Cooler noise at maximum speed even when idle.
    • ⚡ A sharp drop in FPS in games or freezes when working with videos.

    How to diagnose:

    OS Tool Critical temperature
    Windows HWMonitor, Core Temp >85°C for CPU, >95°C for GPU
    macOS iStat Menus, Macs Fan Control >90°C (M1/M2 chips can withstand up to 100°C)
    Linux Terminal: sensors (install package lm-sensors) >80°C for most processors

    Solutions:

    • 🧊 Clean the ventilation holes with compressed air (can WD-40 Specialist). Don't use a vacuum cleaner — it can damage the cooler blades.
    • 🔧 Replace the thermal paste (if the temperature exceeds 90°C when idle). To do this, disassemble the laptop and apply new paste (Arctic MX-6 or Noctua NT-H2).
    • 🖥️ Use a USB powered cooling pad (such as Cooler Master NotePal X3).
    • ⚙️ Disable turbo mode in BIOS (if the laptop is not a gaming one). This will reduce performance by 5-10%, but will eliminate overheating.
    How to check thermal paste without disassembling?

    If, when you lightly press the case in the processor area, the temperature in the monitoring drops by 5–10°C, the paste has dried out and requires replacement.

    3. Viruses and malware: hidden resource stealers

    Malware (malware) can silently load the processor by 30–70%, using it to mine cryptocurrency or send spam. Laptops with pirated software or without antivirus are especially vulnerable. For example, a virus WannaMine increases CPU load to 100% 5–10 minutes after switching on.

    How to detect:

    • 🛡️ Open Task Manager (Windows) or System monitoring (macOS/Linux).
    • 🔍 Sort processes by CPU load. Unknown names like svchost.exe *32 (with typos) or JavaUpdate - a sign of a virus.
    • 📊 Check network activity: if the laptop is transferring data (for example, 100 MB/h) without your knowledge, it may be a botnet.

    How to treat:

    Check processes in Task Manager|Turn off the Internet (so that the virus does not download updates)|Run a scan Kaspersky Virus Removal Tool or Malwarebytes|Remove suspicious programs in Control Panel → Programs and Features|Update OS and antivirus to the latest version-->

    For a deep check:

    1. Download LiveCD with an antivirus (for example, Kaspersky Rescue Disk) and boot from it.
    2. Scan the disk for rootkits (hidden viruses).
    3. If the antivirus does not help, reset the system while saving the files (Settings → Update & Security → Recovery on Windows).
    ⚠️ Attention: Some viruses block the installation of antivirus software. In this case, download the programs on another device and transfer them to a flash drive.

    4. Lack of RAM: when 8 GB is no longer enough

    If the laptop slows down when opening 10+ tabs in the browser or working with Photoshop/AutoCAD, the problem is the shortage random access memory (RAM). Modern websites (eg. Facebook or Google Docs) can consume up to 1–2 GB of RAM per tab. When the memory is full, the system starts using swap file on a hard drive, which is 10–100 times slower.

    How to check:

    • 🖥️ Windows: Ctrl + Shift + Esc → tab Performance → Memory.
    • 🍎 macOS: System Monitoring → Memory (color red or yellow - alarm signal).

    Solutions:

    • 🔄 Close unnecessary programs. For example, Slack, Discord And Telegram in the background consume up to 500 MB of RAM each.
    • 🛠️ Increase the swap file (only for HDD!):
      1. Windows: Control Panel → System → Advanced Settings → Performance → Settings → Advanced → Virtual Memory.
      2. Set the size to 1.5–2 times the amount of RAM (for example, for 8 GB RAM - 12–16 GB swap file).
  • 💾 Add RAM. Most laptops (except MacBook and ultrabooks) allow upgrades. Suitable modules can be found at Crucial.com by laptop model.
  • 🌐 Use easy alternatives to programs:
    • 🦊 Replace Chrome on Firefox or Edge (consumes 20–30% less RAM).
    • 📝 Instead Photoshop try it GIMP or Photopea (online).
    • 💡

    In Windows 10/11, disable unnecessary background applications: Settings → Privacy → Background apps. This will free up up to 1–2 GB of RAM.

    5. Disk fragmentation and file system errors

    On traditional HDDs, file fragmentation can reduce read/write speeds by 5–10 times. Even on SSDs, fragmentation affects performance, although to a lesser extent. In addition, file system errors (for example, after a sudden power outage) lead to freezes when accessing damaged sectors.

    How to diagnose:

    • 🔍 Windows: Open Command line as administrator and enter: 
      chkdsk C: /f /r

      (replace C: to your drive letter).

    • 🐧 Linux: In the terminal, run: 
      sudo fsck -f /dev/sda1

      (replace sda1 to your section; You can find out the name with the command lsblk).

    Solutions:

    Problem Windows Solution Solution for macOS/Linux
    HDD fragmentation Enter in search Defragmentation → select drive → Optimize. Use sudo e4defrag / (for ext4) or utility DriveDX.
    File system errors Team chkdsk /f (requires reboot). Team fsck -y in recovery mode.
    Damaged sectors Utility Victoria or HDDScan for testing. Team badblocks -v /dev/sda.

    If the disk SSD, no defragmentation needed! Instead:

    • 🔄 Turn it on TRIM (optimizes SSD performance): 
      fsutil behavior set disabledeletenotify 0
    • 🗑️ Leave 10-15% free space for the controller to work.
    💡

    If after checking the disk shows errors UNC (unstable sectors), make a backup copy of your data immediately - this is a harbinger of an imminent failure.

    6. Outdated drivers and hardware conflicts

    Incorrect or outdated drivers can cause freezes, especially after updating Windows or connecting a new device (printer, external drive). For example, video card driver NVIDIA 2021 version on Windows 11 may result in a “black screen” when resuming from sleep.

    How to check:

    • 🖥️ Windows: Device Manager → look for devices with a yellow exclamation mark.
    • 🍎 macOS: Driver updates come with system updates (About This Mac → Software Update).
    • 🐧 Linux: Check kernel logs with the command dmesg | grep -i error.

    How to update drivers:

    Download drivers only from the manufacturer's official website|Create a system restore point (Control Panel → Recovery)|Update drivers one at a time, rebooting your laptop after each|Use Driver Booster or Snappy Driver Installer only if you haven't found the driver manually -->

    For specific devices:

    • 🎮 Video card: Download the latest version from the website NVIDIA/AMD/Intel. For laptops, use drivers from the manufacturer (for example, Lenovo Vantage for Lenovo).
    • 🔊 Sound: Remove the old driver via Device Manager (right click → Remove device), then reboot - Windows will install the standard driver.
    • 📶 Wi-Fi/Bluetooth: For modules Intel And Qualcomm download drivers from the laptop manufacturer's website.
      • ⚠️ Attention: Never install drivers from sites like driverpack.io - they often contain viruses or adware.

      7. System reset: when all else fails

      If the laptop slows down even after all the manipulations, the last chance is reset the system to factory settings or clean installation of the OS. This will eliminate software conflicts, viruses and “digital garbage” that has accumulated over years of use.

      How to reset:

      • 🪟 Windows 10/11:
        1. Settings → Update & Security → Recovery → Reset PC.
        2. Select Save my files (will remove programs, but leave documents).
      • 🍏 macOS:
        1. Reboot into recovery mode (Cmd + R when turned on).
        2. Select Reinstall macOS (data will not be deleted).
      • 🐧 Linux:
        1. Create a bootable USB flash drive with the distribution.
        2. When installing, select Install nearby or Erase disk (make a backup!).

    After reset:

    • ⚡ Install only the necessary software. Each new program is a potential source of brakes.
    • 🛡️ Immediately activate the built-in antivirus (Windows Defender or XProtect on macOS).
    • ⚙️ Disable startup of unnecessary programs (Settings → Applications → Startup).
    What to do if the reset didn't help?

    If the laptop slows down even after a clean installation of the OS, the problem is in the hardware: faulty RAM, a fallen SSD contact, or a worn-out battery (on some models it affects performance). In this case, diagnostics are required at a service center.

    8. Hardware faults: when it’s time to take it to service

    If all software methods have been tried, and the laptop continues to freeze, the hardware is to blame. Here are the key signs of hardware problems:

    • 💥 Blue screens of death (BSOD) with errors IRQL_NOT_LESS_OR_EQUAL, MEMORY_MANAGEMENT - indicate faulty RAM.
    • 🔊 Clicking or grinding noises from the case - a sign of HDD failure.
    • 🔋 Laptop turns off when unplugged — the battery or power controller is faulty.
    • 🖥️ Artifacts on the screen (stripes, flickering) - a problem with the video card or matrix cable.

    Diagnostics:

    • 🧪 RAM test: 
      mdsched.exe

      (on Windows) or MemTest86 (bootable flash drive).

    • 💾 Disk check:
      • For HDD: Victoria or HDDScan (test SMART And Bad Blocks).
      • For SSD: CrystalDiskInfo (check options Reallocated Sectors Count And Wear Leveling Count).

      • Repair cost (approx):

      Problem Repair cost (₽) Deadline
      Replacing thermal paste 1 500–3 000 1 day
      Replacing HDD with SSD 3,000–5,000 (without storage cost) 1–2 days
      RAM repair/replacement 2 000–4 000 1 day
      Battery replacement 4,000–10,000 (depending on model) 2–3 days
      ⚠️ Attention: If the laptop is more than 5 years old, repairs may not be cost effective. For example, replacing the motherboard with MacBook Pro 2017 costs 30,000–50,000 ₽ - it’s cheaper to buy a used, newer model.

      FAQ: Answers to frequently asked questions

      ❓ The laptop slows down only in games. What's the matter?

      Most likely the problem is overheating of the video card or lack of video memory. Check GPU temperature with utility MSI Afterburner (must be below 85°C). If the temperature is normal, lower the graphics settings in the game or update the drivers.

      For laptops with NVIDIA Optimus (integrated + discrete graphics) make sure the game runs on a discrete graphics card: right click on the executable file → Run with GPU → High-Performance CPU.

      ❓ Why does my laptop slow down after updating Windows?

      Updates come frequently new bugs or driver conflicts. Try:

      1. Roll back to the previous version: Settings → Update & Security → Recovery → Go back to a previous version of Windows (available 10 days after update).
      2. Uninstall the latest update: Control Panel → Programs → View installed updates → sort by date.
      3. Update drivers manually (especially video card and chipset).
      ❓ How to speed up an old laptop (2–4 cores, 4–8 GB RAM)?

      The maximum performance increase will be given by:

      1. Replacing HDD with SSD (3-5 times faster).
      2. Increase RAM up to 16 GB (if supported).
      3. Installing a light OS:
        • Windows: Windows 10 LTSC (no extra services).
        • Linux: Xubuntu or Linux Mint XFCE.
    • Disabling visual effects: Control Panel → System → Advanced Settings → Performance → Settings → Get better performance.

      • On laptops with processors Intel Core 2 Duo or AMD Athlon (until 2012) even these measures will have a limited effect—consider upgrading to a newer model.

      ❓ Is it possible to use a laptop without a battery if it is swollen?

      Absolutely not. A swollen battery may:

      • Damage the motherboard (due to pressure on components).
      • Explode or ignite (especially when charging).

      If the battery is swollen, Immediately unplug the laptop, remove the battery (if possible) and dispose of it at a special collection point. You can work without a battery, but only if the laptop supports direct power mode (most models Lenovo, Dell, HP this is allowed).

      ❓ Why does the laptop slow down when connecting to the Internet?

      Probable reasons:

      • 🕵️‍♂️ Mining virus: Uses your CPU/GPU to mine cryptocurrency. Check CPU load in Task Manager.
      • 📥 Background updates: Windows, antivirus or programs can download updates. Disable auto-updates in settings.
      • 🔄 DNS problems: Slow ISP DNS servers slow down website loading. Try changing DNS to 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google).
      • 📡 Router overload: If there are many devices connected to the network, limit the bandwidth for the laptop in the router settings (QOS).