Have you noticed that pages take forever to load, video on YouTube Is it constantly “buffered”, and online games lag, although the Internet works fine on your phone or other device? Problem with slow Wi-Fi on a laptop - one of the most common, but its causes are not always obvious. Unlike desktop PCs, laptops are subject to additional factors: from adapter overheating to energy saving conflicts.

In this article we will look at all possible causes of brakes - from the banal (for example, outdated drivers) to the exotic (antivirus interference in network traffic). You'll learn how to diagnose the problem using built-in tools Windows And macOSwhat router settings affect the speed, and why even switching the Wi-Fi channel from 2.4 GHz to 5 GHz can give a speed increase of up to 300% in conditions of urban noise. Let's not waste time on theory - let's move on to practice.

1. Speed check and problem diagnosis

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

  1. Measure your speed on a laptop through services like Speedtest or FAST.com. Record the results (especially the parameter Ping - if it is above 100 ms, this is critical for games).
  2. Check the speed on another device (smartphone, tablet) connected to the same Wi-Fi. If the indicators there are normal, the problem is in the laptop.
  3. Connect the laptop to the router via cable Ethernet. If the speed increases, the wireless adapter or its settings are to blame.

If the speed is low on all devices, call your provider. If only on a laptop, read on. Please note connection stability: If the speed jumps from 10 to 100 Mbps, this may indicate interference or driver problems.

📊 How often does your Wi-Fi on your laptop slow down?
  • Constantly
  • Several times a day
  • Rare, but accurate
  • Never

2. Wi-Fi adapter drivers: update and rollback

Outdated or damaged drivers are the most common cause of slowdowns. Laptop manufacturers (HP, Lenovo, Asus, Dell) frequently release updates for network adapters that optimize performance with new Wi-Fi standards (for example, Wi-Fi 6).

How to update the driver:

  • 🔧 Via Device Manager: press Win + X → select Device Manager → open Network adapters → find your Wi-Fi module (for example, Intel AX200 or Qualcomm Atheros) → right click → Update driver → Automatic search.
  • 💻 From the manufacturer's website: Download the latest driver for your laptop model (please specify the exact model, e.g. Lenovo ThinkPad T14 Gen 2).
  • 🔄 Driver rollback: if the brakes appeared after the update, return to the previous version through the same Device Manager → Properties → tab Driver → Rollback.

Critical error: Microsoft drivers (installed via Windows Update) often perform worse than the original ones from the adapter manufacturer (Intel, Broadcom, Realtek). For example, for adapters Intel Wi-Fi 6 official drivers provide a speed increase of up to 20% compared to native drivers from Windows.

Find the adapter model in Device Manager|

Download the driver from the laptop manufacturer's website (not Windows Update)|

Remove old driver via Removing a device|

Reboot the laptop and install the new driver -->

3. Energy saving settings and adapter operating modes

Windows By default, it limits the performance of the Wi-Fi adapter to save battery power. This can reduce speed by up to 50%! The fix is simple:

  1. Open Control panel → Power supply → Setting up the power plan → Change advanced power settings.
  2. Find a section Wireless adapter settings → Power Saving Mode.
  3. Set value Maximum performance for both states (battery and mains).

For macOS a similar setting is hidden deeper: System Settings → Battery → Battery Optimization (disable it if the laptop is constantly connected to the network).

Also check adapter operating mode:

  • 📡 802.11n (Wi-Fi 4) - up to 150 Mbit/s.
  • 🚀 802.11ac (Wi-Fi 5) - up to 1 Gbit/s.
  • ⚡ 802.11ax (Wi-Fi 6) - up to 2.4 Gbps.

If your adapter supports Wi-Fi 6, but in the router settings it is 802.11n, you lose up to 80% speed!

💡

On laptops Lenovo And HP There are often proprietary utilities for managing Wi-Fi (for example, Lenovo Vantage). They may override Windows settings - check them separately!

4. Interference and Wi-Fi channel selection

In apartment buildings, Wi-Fi networks of neighboring apartments create interference, especially at the frequency 2.4 GHz. This manifests itself as sudden drops in speed or connection breaks. The solution is to change the channel or switch to 5 GHz.

How to choose the optimal channel:

  1. Download the network analysis utility: Wi-Fi Analyzer (Android), NetSpot (Windows/macOS) or inSSIDer.
  2. Start scanning - the program will show the channel load.
  3. Go to your router settings (usually at 192.168.0.1 or 192.168.1.1) and manually set the least busy channel.
Frequency Benefits Disadvantages Recommendations
2.4 GHz Longer signal range, better penetration through walls Low speed (up to 150 Mbps), strong interference Use only for old devices or IoT gadgets
5 GHz High speed (up to 1 Gbps), less interference Short range, less good at passing through obstacles Optimal for laptops within the same room
6 GHz (Wi-Fi 6E) Ultra-high speed (up to 2 Gbps), minimal interference Only supported by new devices, weak signal at a distance For modern laptops (2022+) in direct visibility of the router

If your router supports 5 GHz, but the laptop does not see this network, check the adapter settings: sometimes support for this frequency is disabled in the drivers. For example, for adapters Intel need to go to Device properties → tab Additionally and enable the option Wireless Mode with meaning 802.11a/b/g/n/ac.

How to enable 5GHz support on Windows 10/11

1. Open Device Manager → Network adapters → properties of your Wi-Fi module.

2. Go to the tab Additionally.

3. Find the parameter Band or Preferred Band and set the value 5 GHz first or Auto.

4. Save the changes and restart the laptop.

5. Conflicts with antiviruses and VPNs

Many antiviruses (Kaspersky, ESET NOD32, Avast) scan network traffic in real time, which can slow down the connection. The same goes for VPN services (NordVPN, ProtonVPN), which encrypt traffic and add delays.

How to check the influence of your antivirus:

  • 🛡️ Temporarily disable protection in your antivirus and measure the speed again.
  • 🔍 Check your firewall settings: sometimes it blocks DNS requests or limits the speed for certain applications.
  • 🌐 If you use a VPN, try connecting without it or changing the server (for example, choose a location closer to your region).

On macOS built-in firewall (System Settings → Security and Safety → Firewall) rarely conflicts with Wi-Fi, but if you installed third-party utilities like Little Snitch, they can slow down the network. Disable them for the duration of the test.

💡

Antiviruses with the “Network Protection” function (for example, Kaspersky Safe Money) can reduce speed by 30–50%. Add your browser or game to exceptions if they are the only ones that cause problems.

6. Laptop overheating and hardware problems

The Wi-Fi adapter in laptops is often located next to the processor or video card. When it overheats, it begins to “throttle” (drop frequencies), which leads to speed drops or connection breaks. Check the temperature using HWMonitor (Windows) or iStat Menus (macOS).

Signs of adapter overheating:

  • 🌡️ Speed drops after 10-15 minutes of work.
  • 🔌 The connection disappears when connecting to the network.
  • 💨 The laptop cooler operates at maximum speed.

Solutions:

  • 🧹 Clean the cooling system from dust (especially important for laptops over 3 years old).
  • 🖥️ Use a cooling pad with fans.
  • ⚙️ Lower the maximum power of the adapter in the settings (in Device Manager → Properties → Additionally → Transmit Power, install Middle or Low).
⚠️ Attention: If your laptop overheats even when idle, this may indicate a lot of dust or dry thermal paste. In this case, professional cleaning is required.

7. Router settings: what can slow down Wi-Fi

Even if the problem is on the laptop side, some router settings can aggravate the slowdown. Check the following settings (the control panel address is usually indicated on the router sticker):

  • 📶 Channel width: for 5 GHz install 80 MHz (if the router supports it). For 2.4 GHz better leave it 20 MHz (wide channels here will only worsen the situation due to interference).
  • 🔒 Security type: use WPA2-PSK or WPA3. Outdated WEP Not only is it unsafe, but it also slows down the network.
  • 🔄 Operating mode: If you have a dual-band router, turn on the mode Smart Connect (automatic switching between 2.4 And 5 GHz).
  • 📡 Transmission power: in some routers (for example, ASUS RT-AX88U) you can increase the signal strength to 100% (the default is often 75%).

Also note router firmware. Outdated software may contain bugs that affect speed. Update the firmware via the web interface (section Administration or System Tools).

If you have mesh system (For example, Google Nest Wi-Fi or TP-Link Deco), check which node the laptop is connected to. Sometimes devices cling to the farthest node with a weak signal. Manually select the closest one in the network settings.

8. Alternative solutions: from a USB adapter to a network reset

If none of the above helps, try radical measures:

  • 🔌 USB Wi-Fi adapter: external adapters (eg TP-Link Archer T4U or ASUS USB-AC68) often work more stable than built-in ones, especially in older laptops.
  • 🔄 Resetting network settings: 
    netsh winsock reset

    netsh int ip reset
    

    ipconfig /flushdns

    Run these commands in Command line (as administrator) and reboot the laptop.

  • 🖥️ Clean Windows installation: If the brakes appear after a system update, conflicting services may be to blame. Reinstalling the OS will solve the problem.
  • 📱 Mobile hotspot: Connect your laptop to the Internet via your smartphone (in modem mode). If the speed is normal, the problem is definitely in the home network.
⚠️ Attention: Before resetting your network settings, write down all important settings (for example, static IP, if used). After resetting, you will have to configure them again.

If you are using macOS, to reset the network, do:

  1. Open Terminal.
  2. Enter the command: 
    sudo ifconfig en0 down

    sudo ifconfig en0 up

    (replace en0 to your network interface, if different).

  3. Restart your Mac.

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

Why does Wi-Fi slow down only on a laptop, but works fine on a phone?

This clearly indicates a problem with the drivers, power saving settings, or hardware limitations of the laptop. Start by updating your Wi-Fi adapter drivers and checking your power settings (turn off the power saving mode for your network adapter). The Wi-Fi module may also overheat - check the temperature of the laptop.

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

B Windows: open Device Manager (Win + X), expand the section Network adapters — there will be a model (for example, Intel Wi-Fi 6 AX200). B macOS: About This Mac → System Report → Networks → Wi-Fi.

Can an antivirus slow down Wi-Fi?

Yes, especially if it has traffic scanning features (e.g. Kaspersky Safe Money or Avast Web Shield). Temporarily disable your antivirus and check the speed. If it has grown, add the browser or game to your antivirus exceptions.

What to do if the laptop does not see the 5 GHz network?

Check:

  1. Does your Wi-Fi adapter support 5 GHz (find out the model and look at the specifications).
  2. Is support enabled? 5 GHz in the router settings (sometimes it is disabled by default).
  3. Are the adapter drivers updated (download them from the laptop manufacturer's website).

If the adapter is old (for example, Broadcom 4313), it may not support 5 GHz - then only replacing it with an external USB adapter will help.

Why does Wi-Fi speed drop in the evening?

This is due to channel overload: in the evening, neighbors actively use the Internet, and their routers create interference. Solutions:

  • Switch to 5 GHz (there is less interference there).
  • Manually select a less busy channel in the router settings (use Wi-Fi Analyzer for analysis).
  • Limit the bandwidth for other devices on your network (for example, through QoS in the router).