Has your laptop started to launch programs more slowly, hesitates when opening tabs in the browser, or even freezes for a few seconds? Such symptoms are familiar to most users, but not everyone knows how to correctly diagnose the problem. Brakes can be caused by both hardware faults (for example, CPU overheating or drive wear), and software failures - from background activity of viruses to errors in drivers.

In this article we will look at all possible reasons for laptop slowdown, including those that are rarely discussed in standard guides (for example, the influence BIOS/UEFI or conflicts Thunderbolt-devices). You will learn how to check each factor yourself, what tools to use for diagnostics, and what to do to restore the device's performance - without contacting a service center. Let's start with the most obvious reasons and gradually move on to hidden pitfalls.

1. Overheating of components: how to check and fix

Overheating is one of the most common causes of slowdowns, especially on laptops older than 3 years. When the temperature CPU or video cards exceeds the critical level (usually 90–95°C), the system automatically reduces their performance (thermal throttling) to avoid damage. As a result, you experience sudden stuttering even during simple tasks.

To diagnose overheating:

  • 🌡️ Use monitoring utilities: HWMonitor (Windows), iStat Menus (macOS) or Psensor (Linux). They will show the temperature of all components in real time.
  • 🔥 Check the operation of the cooler: if it does not spin up or makes strange sounds, it most likely requires cleaning or replacing the thermal paste.
  • 📉 Run a stress test (e.g. Prime95 or FurMark) and monitor the temperature under load.

If the temperature is above normal:

⚠️ Attention: Do not use the laptop on soft surfaces (blanket, sofa) - this will block the ventilation holes. Even short-term work 100°C can reduce processor life by 30–50%.
📊 How often do you clean your laptop cooling system?
  • Once a year
  • Once every 2–3 years
  • Only when it starts to slow down
  • Never

2. Lack of random access memory (RAM)

If the laptop slows down when opening several tabs in the browser or starting Photoshop/AutoCAD, the problem is most likely in lack of RAM. Modern applications and websites consume more and more memory: for example, one tab Google Chrome with YouTube can "eat" up to 1–1.5 GB RAM.

How to check:

  • 🖥️ On Windows: open Task Manager (Ctrl+Shift+Esc) → “Performance” tab → “Memory”. If loading is close to 80–100%, there is not enough memory.
  • 🍎 On macOS: run System monitoring (in Programs → Utilities) and check the Memory graph.
  • 🐧 On Linux: enter the command in the terminal 
    free -h
    and look at the line used in the column Mem.

Solutions:

Problem Solution Cost
Not enough RAM for current tasks Add a RAM stick (for example, from 4 GB to 8–16 GB) From 2,000 ₽
Background processes eat up memory Disable unnecessary programs in startup Free
Browser is consuming too much RAM Use Firefox with setting config:browser.tabs.unloadOnLowMemory Free
💡

If you can't add RAM, enable the page file on the SSD (not HDD!): in Windows this is done in Control Panel → System → Advanced Settings → Performance → Advanced → Virtual Memory.

3. Full or damaged drive

Hard disk (HDD) or SSD can slow down a laptop for three reasons: physical wear, overflow or file system errors. For example, if on HDD less left 10% free space, the system begins to fragment files, which sharply reduces the read/write speed. On SSD the problem manifests itself differently: when filling more than 80% The recording speed drops by 2–3 times.

Diagnostics:

  • 📊 Check free space: on Windows - This computer, on macOS - About This Mac → Storage.
  • 🛠️ Perform a disk health test:
    • For HDD: utility CrystalDiskInfo (will show the parameter Reallocated Sectors Count).
    • For SSD: team in PowerShell (Windows): 
      Get-PhysicalDisk | Get-StorageReliabilityCounter | Select *

If the disk is damaged:

⚠️ Attention: Don't ignore mistakes SMART (For example, Uncorrectable Errors or Pending Sectors). These are signs of the imminent death of the drive - transfer the data to another drive as soon as possible!

☑️ Storage optimization

Done: 0 / 4

4. Viruses, mining bots and malware

Malware can not only steal data, but also use laptop resources for cryptocurrency mining or DDoS attacks. Symptoms of infection: sudden freezes, high CPU usage (50–100%) for no apparent reason, slow internet. Laptops with pirated software or without antivirus.

How to detect:

  • 🔍 Open Task Manager (Windows) or System monitoring (macOS) and sort processes by CPU usage. Unknown processes with names like svchost.exe *32 or JavaUpdate - a reason to be wary.
  • 🛡️ Perform a scan:
    • Windows Defender (built into Windows 10/11) - run Virus protection → Quick scan.
    • Malwarebytes (free version) - finds mining bots and spyware.
    • Kaspersky Virus Removal Tool - for deep checking.

If the antivirus doesn’t find anything, but the laptop still slows down:

How to remove hidden miners manually

Open Job Scheduler (taskschd.msc) and check the list of tasks for suspicious entries (for example, with random letters in the name). Also check the folders C:\Users\<name>\AppData\Roaming And C:\ProgramData for the presence of unknown .exe files.

5. Outdated or conflicting drivers

Drivers are “intermediaries” between hardware and the operating system. If they are outdated or installed incorrectly, the laptop may slow down, lose connection to Wi-Fi, or even turn off without warning. Problems occur especially often after updating Windows or connecting new devices (for example, Thunderbolt dock or external video card).

How to check drivers:

  • 🚗 On Windows:
    1. Open Device Manager (Win+X → Device Manager).
    2. Check sections with exclamation marks (eg Video adapters or Network adapters).
    3. Update drivers manually via the manufacturer's website (do not use Driver Booster — they often install incompatible versions!).
  • 🍏 On macOS: Driver updates come with system updates (System settings → Software update).

    • Top 3 drivers that most often cause a laptop to slow down:

    1. Video driver (especially on NVIDIA Optimus or AMD Radeon). Signs: artifacts on the screen, slow page scrolling.
    2. Chipset driver (responsible for the operation of USB, SATA, PCIe). Symptoms: Devices connect with a delay.
    3. Network card driver (may cause lags in games or when streaming videos).
    💡

    If, after updating the driver, the laptop begins to slow down even more, roll it back: in Device Manager, right-click on the device → Properties → Driver → Roll Back.

    6. Disk fragmentation (relevant for HDD)

    If your laptop is equipped hard disk drive (HDD), not SSD, over time, the files on it “split” into fragments scattered across different sectors. This causes the disk head to constantly “jump”, which dramatically reduces the read/write speed. On SSD Fragmentation is not critical, but can reduce lifespan.

    How to check fragmentation:

    • 📁 On Windows: open Disk optimization (type in search) and see the percentage of fragmented files.
    • 🐧 On Linux: use the command 
      sudo e4defrag -c /
      (for file system ext4).

    Solutions:

    Fragmentation level Action
    Less than 10% No defragmentation required
    10–30% Run the built-in defragmenter (Windows) or e4defrag (Linux)
    More than 30% It is better to transfer data to a new disk (HDD or SSD) and format the old one

    7. Operating system malfunctions

    Sometimes the laptop slows down due to damaged system files, update conflicts or registry errors. For example, after an unsuccessful update Windows 10→11 or reset macOS Lags may occur when opening the Start menu or Finder. In Linux, similar problems occur after incorrect package updates.

    Diagnosis and correction:

    • 🪟 Windows:
      • Check the integrity of system files: 
        sfc /scannow
      • Recover damaged images: 
        DISM /Online /Cleanup-Image /RestoreHealth
      • Reset the update cache: stop the service Windows Update and delete the folder C:\Windows\SoftwareDistribution\Download.
    • 🍎 macOS:
      • Run Disk Utility and check the disk for errors.
      • Reset NVRAM And SMC (instructions on Apple website).
      • Reinstall the system via macOS recovery (without deleting data).

    If system errors recur:

    ⚠️ Attention: Don't use "registry cleaners" like CCleaner — they often delete critical keys, which leads to even greater failures. Instead, create a new account on the system and check if the brakes persist.

    8. Hardware conflicts

    Rarely, but aptly: the laptop may slow down due to hardware conflicts. For example:

    • 🔌 Connected via USB 3.0 the device (external drive, smartphone) “takes away” bandwidth from other components.
    • 🖥️ Two graphics adapters (Intel UHD + NVIDIA/AMD) conflict due to incorrect settings in BIOS.
    • 🔊 Sound card or Thunderbolt-the controller blocks interrupts (IRQ), which leads to input delays.

    How to diagnose:

    1. Disconnect all external devices (flash drives, docking stations, mouse/keyboard) and check if the brakes persist.
    2. Go to BIOS/UEFI (usually by key F2, Del or Esc when loading) and:
      • Disable Secure Boot (if you are using Linux).
      • Check the download priority (sometimes the conflict occurs due to the connected M.2 SSD in the wrong slot).
  • On Windows open Device Manager and check if there are any devices with error Code 12 (“Not enough resources”).
    • 💡

    If the laptop only slows down when running on battery power, check the power plan settings: in Windows, open Control Panel → Power Options → Advanced Settings and set maximum performance for both modes (mains/battery).

    FAQ: Frequently asked questions about laptop brakes

    My laptop only slows down when playing games. What's the matter?

    Most likely, the problem is one of three factors:

    1. Video card overheating - check the temperature in MSI Afterburner.
    2. Lack of video memory - if you have integrated graphics (For example, Intel UHD), lower the graphics settings in the game.
    3. Driver conflict - remove old versions via Display Driver Uninstaller (DDU) and install the latest ones from the manufacturer's website.
    Laptop slows down after Windows update. What to do?

    Try the following steps:

    1. Roll back the update: Settings → Update & Security → Windows Update → View history → Uninstall updates.
    2. Disable unnecessary services: click Win+R, enter msconfig, go to the "Services" tab and disable everything except system ones.
    3. Restore your system from a restore point (if you have one).
    Can a laptop slow down due to an old BIOS version?

    Yes, but it's unlikely. Update BIOS/UEFI may help if:

    • The manufacturer has corrected compatibility errors with new processors or drives.
    • The current version has bugs with power management (for example, the laptop does not go into sleep mode correctly).

    ⚠️ Update the BIOS only if you are sure of the stability of the power supply - interrupted firmware can make the laptop inoperable!

    How can you tell if your laptop is slowing down because of a virus and not because of the hardware?

    Signs of viral activity:

    • High CPU/network usage even without running programs.
    • The laptop slows down at regular intervals (for example, every 10 minutes).
    • Unknown processes appear in Task Manager (For example, csrss.exe with high memory consumption).
    • The antivirus blocks suspicious connections to servers in China, Russia or the Netherlands.

    To check use Process Explorer (from Microsoft) - It will show you which files and registry keys each process is using.

    Is it worth changing the HDD to an SSD if the laptop is slow?

    Yes, in 90% of cases this is the most effective solution. Replacement HDD on SSD speeds up:

    • System boot - from 30–60 seconds to 5–10 seconds.
    • Opening programs - e.g. Photoshop starts 3–5 times faster.
    • Copying files - read/write speed grows with 80–120 MB/s (HDD) up to 500–3500 MB/s (SSD).

    Exceptions: if the brakes are caused faulty processor or damaged motherboard, replacing the disk will not help.