Why Wi-Fi on a laptop is slow and how to fix it

Have you noticed that Internet on a laptop is much slowerthan on a phone or tablet connected to the same network? Pages take forever to load, videos are constantly stuck on buffering, and online games lag even with a stable signal. There can be a dozen reasons for this behavior - from banal router settings to hardware problems with Wi-Fi adapter.

In this article we will look at all possible reasons for slow Wi-Fi on a laptop (as opposed to the universal advice “reboot the router”), including rare cases that are not written about in standard instructions. You will learn how to diagnose the problem, what settings Windows 10/11 or macOS affect the speed, and when it’s time to take the device to service. Let's start with the simplest thing - checking the current speed and comparing with other devices.

1. Checking the actual speed: comparing the laptop with other devices

Before delving into the settings, make sure that the problem is with the laptop and not with the ISP or router. To do this:

• 📱Connect to the same network Wi-Fi smartphone, tablet or second laptop.
• 📊 Perform a speed test on all devices via Speedtest or Fast.com.
• 📡 Check the signal level: on Windows look at the number of “sticks” in the tray, on macOS - in the menu bar.

If the speed on other devices is normal, but on a laptop it is 2–5 times lower, the problem is definitely there. If all devices slow down, the router or provider is to blame (go to section 4).

⚠️ Attention: Conduct speed tests at the same time of day - in the evening, many providers artificially “stifle” speed due to network congestion.

2. Software reasons: viruses, drivers and background processes

Most often slow Wi-Fi on a laptop related to software. Here's what you need to check first:

2.1. Outdated or faulty adapter drivers

Driver Wi-Fi adapter may not work correctly after a system update or conflict with other programs. To update it:

1. Click Win + X → select Device Manager.
2. Expand the thread Network adapters → find your Wi-Fi module (For example, Intel Wi-Fi 6 AX200 or Qualcomm Atheros QCA61x4).
3. Right click → Update driver → Automatic search.

If automatic updating does not help, download the driver from the laptop manufacturer's website (Lenovo, HP, Dell etc.) or chipset (Intel, Broadcom). For macOS Drivers are updated via Software update in the system settings.

2.2. Viruses and malware

Some viruses use your internet traffic for mining, spamming or DDoS attacks. Check the system:

• 🛡️ Run a deep scan in Windows Defender (Windows Defender → Extended check).
• 🔍 Use utilities like Malwarebytes or Kaspersky Virus Removal Tool.
• 📊 Look at the task manager (Ctrl + Shift + Esc): if some process is eating traffic for no reason, delete it.

Delete temporary files (via Disk Cleanup)

Disable startup of unnecessary programs

Check the list of installed browser extensions

Update anti-virus databases-->

2.3. Background updates and downloads

Windows 10/11 And macOS often download updates in the background, taking up the channel. Disable them temporarily:

• 🪟 On Windows: Settings → Update & security → Advanced options → Pause updates for 7 days.
• 🍎 On macOS: System Settings → General → Software Update → uncheck Automatically keep macOS up to date.

Also check the downloads in Steam, Epic Games, Origin or torrent clients - they can limit the speed for other programs.

3. Problems with the router: channels, standards and interference

If the laptop slows down Wi-Fi, and the cable works fine, the router settings are to blame. Here's what you can do without deep knowledge:

3.1. Changing the Wi-Fi channel

Modern routers automatically select the channel, but often make mistakes. Canals in apartment buildings 1–6 (2.4 GHz) are usually overloaded. Try:

1. Go to your router control panel (usually 192.168.0.1 or 192.168.1.1).
2. Find a section Wi-Fi or Wireless network.
3. Change the channel to 11–13 (for 2.4 GHz) or any free range 36–165 (5 GHz).

To analyze channel congestion, use utilities Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS).

3.2. Switch to 5 GHz

Range 5 GHz is less susceptible to interference and supports higher speeds, but has a smaller coverage area. If your laptop and router support Wi-Fi 5 (802.11ac) or Wi-Fi 6 (802.11ax), switch to it:

• 📶 In the router settings, enable a separate network for 5 GHz (usually called Wi-Fi_5G).
• 🖥️ On your laptop, connect to this network.
• 🔄 If the signal is weak, return to 2.4 GHz or use Mesh system.

⚠️ Attention: Older laptops (pre-2015) may not support 5GHz. Check the specifications of your model on the manufacturer's website.

3.3. QoS Settings and Speed Limiting

Some routers artificially limit the speed for individual devices through QoS (Quality of Service). To disable:

1. Go to the router panel → section QoS or Bandwidth Management.
2. Disable QoS or remove the laptop from the list of restricted devices.
3. Save the settings and reboot the router.

4. Hardware problems: adapter, antennas and overheating

If software methods do not help, the problem may lie in the hardware. Here's what we check:

4.1. Physical damage to the Wi-Fi adapter

Shocks, drops, or liquids may damage Wi-Fi module. Signs:

• 🔌 The laptop does not see the network or sees them only next to the router.
• 🔄 The speed drops with the slightest movement of the laptop (problem with antennas).
• 🚨 B Device Manager There is an exclamation mark next to the adapter.

Solution: take the laptop to a service center for diagnostics. On some models (Lenovo ThinkPad, Dell Latitude) Wi-Fi module you can replace it yourself.

4.2. Laptop overheating

Overheating Wi-Fi adapter may automatically reduce speed or turn off. Check the temperature:

• 🌡️ Use utilities HWMonitor or Core Temp.
• 💨 If the temperature is higher 80°C — clean the laptop from dust or replace the thermal paste.
• 🔄 Try connecting to Wi-Fi immediately after turning on the laptop (when it is cold).

4.3. Incompatibility of Wi-Fi standards

If your laptop supports Wi-Fi 6 (802.11ax), and the router only Wi-Fi 4 (802.11n), the speed will be limited to the old standard. Check:

Wi-Fi standard	Max. speed	Frequency
Wi-Fi 4 (802.11n)	150–600 Mbit/s	2.4 GHz / 5 GHz
Wi-Fi 5 (802.11ac)	up to 3.5 Gbit/s	5 GHz
Wi-Fi 6 (802.11ax)	up to 9.6 Gbit/s	2.4 GHz / 5 GHz

Solution: update your router or disable support for old standards in its settings (802.11b/g).

5. Windows and macOS settings that slow down Wi-Fi

Operating systems have hidden parameters that affect speed Wi-Fi. Let's look at the most important ones.

5.1. Windows Bandwidth Limit

Windows 10/11 by default reserves 20% of the bandwidth for system tasks. To disable:

1. Click Win + R → enter gpedit.msc → Enter.
2. Go to: Computer Configuration → Administrative Templates → Network → QoS Packet Scheduler.
3. Find the parameter Limit reserved bandwidth → install Included → put 0%.

For Windows Home (where there is no gpedit.msc) use this patch.

5.2. Adapter power settings

Default Windows saves energy while reducing productivity Wi-Fi adapter. Correcting:

1. Open Device Manager → Network adapters.
2. Right click on the adapter → Properties → tab Power management.
3. Uncheck Allow this device to turn off to save power.

On macOS a similar setting is in System Settings → Energy Saving.

5.3. Resetting network settings

If the previous methods did not help, reset the network stack:

• 🪟 On Windows:

  netsh winsock reset
  netsh int ip reset
  ipconfig /flushdns

  Then restart your laptop.

• 🍎 On macOS:

  sudo ifconfig en0 down
  sudo ifconfig en0 up

  (replace en0 to your interface found via ifconfig).

6. External interference: neighbors, microwaves and walls

Even perfectly tuned Wi-Fi may slow down due to external factors. Here's what interferes with the signal:

• 📡 Other Wi-Fi networks on the same channel (especially in apartment buildings).
• 🔌 Household appliances: microwaves, cordless phones, baby monitors.
• 🧱 Thick walls, metal structures, mirrors.
• 🌳 Trees and plants (yes, they absorb the signal!).

Solutions:

• 📍 Move the router to the center of the apartment, raise it higher (on the closet).
• 🔄 Use repeater or Mesh system to strengthen the signal.
• 🛡️ Replace the router antennas with more powerful ones (if the model supports it).

How to check the interference level?

Download the app Wi-Fi Analyzer (Android) or NetSpot (PC/macOS). In mode Channel analysis you'll see which networks are blocking your signal. The optimal channel is the one with the fewest neighbors.

7. Alternative solutions: from a USB adapter to a 4G modem

If all else fails, consider drastic measures:

7.1. External USB Wi-Fi adapter

Cost: from 500 to 3000 rubles. Benefits:

• 🚀 Support Wi-Fi 6 and speeds up to 1–2 Gbit/s.
• 📶 External antenna for better reception.
• 🔄 Compatible with any laptop (even with a broken built-in adapter).

Recommended models: TP-Link Archer T4U, ASUS USB-AX56, D-Link DWA-192.

7.2. Connection by cable or via Powerline

If the router is far away and laying the cable is inconvenient, use Powerline adapters (Internet transmission via electrical wiring). Speed: up to 1 Gbit/s.

7.3. Mobile Internet (4G/5G)

If your provider is constantly throttling your speed, connect 4G modem (For example, Huawei E3372) or use tethering from a smartphone. Disadvantage: traffic limitation.

8. When should I contact the service?

If you have tried everything in this article and Wi-Fi on a laptop is still slow, the problem may be:

• 🔧 Breakdown Wi-Fi module (needs replacement).
• 🖥️ Motherboard malfunctions (laptop repair or replacement).
• 📡 Router defect (check on another device).

The cost of diagnostics in the service: from 500 to 1500 rubles. Repair Wi-Fi module will cost 2000–5000 rubles (depending on the laptop model).

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

FAQ: Frequently asked questions about slow Wi-Fi on a laptop

🔍 Why is Wi-Fi fast on your phone, but slow on your laptop?

This is a common situation when the problem is in drivers, power settings or hardware incompatibility. Start with section 2 (software reasons) and section 4 (hardware problems).

📶 How can I find out which Wi-Fi adapter is in my laptop?

On Windows: open Device Manager → Network adapters. On macOS: About This Mac → System Report → Network. You can also look at the model on the sticker under the laptop or in the documentation.

🔄 Can antivirus slow down Wi-Fi?

Yes, some antiviruses (for example, Kaspersky, Avast) scan network traffic in real time, which reduces speed. Try temporarily disabling protection or adding a browser/game exception.

💻 Why does the speed drop when connected via VPN?

A VPN encrypts traffic and routes it through a remote server, which always reduces speed. If the Internet is fast without a VPN, the problem is not in the laptop. Try changing the server or protocol (for example, from OpenVPN on WireGuard).

🔌 What to do if even the cable connection is slow?

In this case, the problem is not with Wi-Fi, but with the provider, router or laptop network card. Check:

1. Connect the cable directly to the laptop (bypassing the router).
2. Call your provider and find out if there are any restrictions on your tariff.
3. Test another cable (possibly damaged Ethernet port).