Have you noticed that Wi-Fi speed on laptop suddenly fell, although the Internet is stable on your phone or tablet? This problem is familiar to millions of users - according to NetSpot, up to 40% of complaints about slow Internet are related specifically to incorrect operation of the wireless network on laptops. The reasons may lie in the hardware limitations of the device, as well as in software failures, router settings, or even external interference.

Unlike desktop PCs, laptops are more vulnerable to Wi-Fi problems due to their compact antennas, energy savings, and portability. For example, overheating of the Intel AX200 adapter under prolonged load can reduce the speed by 30-50% - this nuance is rarely mentioned in standard instructions. In the article we will analyze systemic and non-obvious reasons, and also give step-by-step solutions for Windows 10/11 And macOS.

1. Checking basic parameters: what to exclude first

Before you dig deep into the settings, make sure that the problem is not hidden on the surface. Start with basic checks:

  • 📶 Test on other devices: Connect your smartphone, tablet or second laptop to the same network. If the speed is low everywhere, the problem is with the router or provider.
  • 🔌 Checking the cable connection: Connect the laptop to the router via Ethernet-cable. If the speed over the wire is normal, the Wi-Fi adapter or its driver is to blame.
  • 🔄 Rebooting the equipment: Turn off the router for 30 seconds, then restart the laptop. In 20% of cases this resolves temporary DHCP failures.
  • 📊 Speedtest: Perform a speed test on Speedtest.net or Fast.com. Compare the results with your provider's tariff.

If after these steps the problem remains, proceed to diagnostics. Please note: laptops with adapters Realtek RTL8821CE often lose speed when connected to 5 GHz networks due to outdated drivers. This is one of the most common reasons for Windows.

📊 What Wi-Fi adapter do you have?
  • I don't know
  • Intel
  • Realtek
  • Broadcom
  • Qualcomm Atheros
  • Other

2. Router settings: hidden parameters that slow down Wi-Fi

Most users never go to the router control panel, but in vain. Non-optimal settings can choke speed specifically for laptops, leaving smartphones untouched. Here are the key parameters to check:

Parameter Recommended value Why is it important
Wireless Mode 802.11ac (or AX for Wi-Fi 6) Mode 802.11n limits the speed to 300 Mbps, even if the tariff is higher.
Channel Width 40 MHz (for 5 GHz) or 20/40 MHz Narrow strip (20 MHz) reduces the speed by 2-3 times.
Beamforming Enabled Technology for focusing the signal on the device. Particularly important for laptops with weak antennas.
WMM (Wi-Fi Multimedia) Enabled Responsible for traffic prioritization. Disabling it may cause lag.

How to get into the router settings? Enter in the browser address bar 192.168.0.1 or 192.168.1.1 (usually login/password admin/admin or indicated on the device label). For models ASUS RT-AX88U, TP-Link Archer C6 And Keenetic path to Wi-Fi settings: Wireless network → Settings.

⚠️ Attention: If your router supports Wi-Fi 6 (802.11ax), but the laptop was released before 2019, forced activation of the mode AX may lead to connection interruptions. In this case, select 802.11ac.
How to find out the router model if the sticker has worn off?

Open a command prompt on your laptop and type: 

ipconfig /all

Find the line "Default gateway" - this is the IP of your router. Enter it in the browser, log in and look at the model in the “System” or “Status” section.

3. Drivers and adapter settings: why Windows “strangles” Wi-Fi

The operating system may artificially limit Wi-Fi speed due to outdated drivers, power saving modes, or conflicts with other programs. Let's start with the drivers:

  1. Checking the driver version:

    Open Device Manager (Win + X → Device Manager), find the section Network adapters. Right-click on your Wi-Fi adapter (for example, Intel Wi-Fi 6 AX200) and select Properties → Driver. Compare the version with the latest one on the manufacturer's website.

  2. Driver update:

    Download the driver from the official website:

  • Driver rollback:

    If the problem appeared after the update, go back to the previous version via Properties → Driver → Roll Back.

    • Pay special attention energy saving settings. By default, Windows limits the power of the Wi-Fi adapter to save battery. To disable this:

    1. Go to Device Manager → Network Adapters → [your adapter] → Properties → Power Management.
    2. Uncheck Allow this device to turn off to save power.
    3. For adapters Intel also disable Throughput Booster in additional parameters (may cause delays).

    ☑️ Checking Wi-Fi drivers

    Done: 0 / 5

    4. External interference and physical factors: invisible enemies of the signal

    Even a perfectly configured router and laptop can suffer from low speeds due to external interference. Here are the main sources of problems:

    • 📡 Overloaded channels: In apartment buildings, up to 20 networks can broadcast on one channel. Use utilities like Wi-Fi Analyzer (Android) or NetSpot (macOS/Windows) for load analysis.
    • 🔌 Electrical appliances: Microwaves, cordless phones (DECT), baby monitors and even USB 3.0 devices create interference in the 2.4 GHz band.
    • 🏗️ Obstacles: Concrete walls, metal structures, mirrors and aquariums weaken the signal. For example, a 30 cm thick wall made of reinforced concrete reduces the signal power by 50-70%.
    • 🌡️ Temperature: Overheating of the router (above 60°C) or laptop (especially adapters Realtek RTL8852AE) leads to an automatic reduction in transmit power.

    Solutions:

    • Switch to range 5 GHz (less loaded, but passes through walls worse).
    • Manually select the channel in the router settings (for example, 36 or 149 for 5 GHz).
    • Install the router at a height of 1-1.5 meters from the floor and away from metal surfaces.
    • For laptops with external antennas (e.g. Dell Latitude) try changing their position.
    💡

    If you have a dual-band router, name the 2.4 GHz and 5 GHz networks differently (for example, MyWiFi_2G And MyWiFi_5G). This will allow you to manually select the optimal range on your laptop.

    5. Software conflicts: what prevents Wi-Fi from working at full capacity

    Slow speeds can be caused by background processes, antivirus programs, or even standard Windows features. Let's look at typical scenarios:

    • 🛡️ Antiviruses and firewalls: Kaspersky, Avast and built-in Windows Defender Sometimes data packets are blocked. Try temporarily disabling protection and repeating the speed test.
    • 🔄 VPN and proxy: Services like NordVPN or ProtonVPN can limit the speed to 30-50% of the original. Disable them to check.
    • 📥 Background updates: Windows, macOS or programs (such as Steam, Epic Games) can download data in the background. Check in Task Manager (tab Network).
    • 🎮 Game overlays: NVIDIA GeForce Experience, Discord or Steam Overlay consume traffic even in standby mode.

    For Windows 10/11 also worth checking QoS parameters (Quality of Service), which can reserve part of the bandwidth:

    1. Open Control Panel → Network Connections.
    2. Right click on your Wi-Fi connection → Properties.
    3. Click Customize → tab Additionally.
    4. Find the parameter Packet Priority & VLAN or QoS Mode and install Disabled.
    ⚠️ Attention: On laptops ASUS ROG And MSI firmware Armoury Crate or Dragon Center can forcefully limit network traffic in "quiet" cooling modes. Check the settings of these utilities.

    6. Hardware problems: when the hardware is to blame

    If all software methods have been tried, but the speed is still low, the problem may lie in the hardware. Let's consider typical cases:

    • 🔌 Damaged Wi-Fi module: Often occurs after a laptop has been dropped or spilled with liquid. Symptoms include intermittent network shutdowns or speeds below 10 Mbps.
    • 🔋 Battery wear: When the charge level is below 20%, some laptops (for example, HP Pavilion) automatically reduce the power of the adapter.
    • 📶 Weak antennas: In budget models (for example, Acer Aspire 3 or Lenovo IdeaPad 3) often install single-band adapters without support MU-MIMO.
    • 🔥 Overheating: If the laptop heats up above 80°C, the Wi-Fi controller may turn off or work in emergency mode.

    How to diagnose hardware problems:

    1. Test on another router: Connect your laptop to another network (for example, in a cafe or with friends). If the speed is normal, the problem is with your router or provider.
    2. Checking in Safe Mode: Boot Windows into safe mode with network support. If the speed is restored, the software is to blame.
    3. Adapter diagnostics: B Command line do: 
      netsh wlan show interfaces

      Look at the parameter Receive rate (Mbps). If it is below 100 Mbps when connected to a 5 GHz network, the adapter is not working correctly.

    For laptops with a removable Wi-Fi module (for example, Dell XPS or ThinkPad) you can try to reconnect it:

    1. Turn off the laptop and remove the battery (if possible).
    2. Open the back cover and locate the Wi-Fi module (usually under a small metal cover).
    3. Disconnect the antennas and remove the module, then install it back.
    💡

    If the laptop is older than 5 years and does not support 802.11ac, upgrade to an external USB adapter (for example, TP-Link Archer T4U) can increase speed by 3-5 times.

    7. Specific macOS problems: why MacBook slows down Wi-Fi

    Laptops Apple are also not immune to problems with Wi-Fi, and the reasons are often unique to macOS. Here's what to check first:

    • 🍎 macOS update: In versions Monterey 12.3 And Ventura 13.0 There were widespread complaints about connection dropouts with 5 GHz networks. Update your system to the latest version.
    • 🔄 Reset NVRAM: Turn off your MacBook, then turn it on and immediately press Option + Command + P + R for 20 seconds. This will reset your network settings.
    • 📡 Location settings: Go to System Settings → Network → Wi-Fi → Advanced and delete all saved networks. Then add your network again.
    • 🔒 Little Snitch Firewall: If installed, it can block DNS queries. Add an exception for mDNSResponder.

    For MacBook Pro/Air with M1/M2 chip there is also a problem with automatic switching between 2.4 GHz and 5 GHz. To disable this:

    1. Open Terminal (Applications → Utilities → Terminal).
    2. Enter the command: 
      sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z

      (you will need to enter the administrator password).

    3. Restart your laptop.

    If the problem persists, try create a new network location:

    1. Open System Settings → Network.
    2. In the drop down menu Location select Change locations....
    3. Click +, name the new location (for example, Home New) and configure the connection again.

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

    Why is the speed normal on the phone, but not on the laptop?

    This is a situation where the problem lies in the laptop. Reasons:

    • Outdated Wi-Fi adapter driver (especially important for Realtek).
    • Limit adapter power consumption in Windows settings.
    • Hardware incompatibility with the router settings (for example, the adapter does not support 80 MHz channels).

    Start by updating your drivers and disabling power saving for your network adapter.

    How can I check if my laptop supports Wi-Fi 5 (802.11ac) or Wi-Fi 6 (802.11ax)?

    Verification methods:

    1. B Windows: open Device Manager → Network Adapters, find the adapter model and search for its specifications on Google. For example, Intel Wi-Fi 6 AX200 supports 802.11ax.
    2. B macOS: Click on the Wi-Fi icon in the menu bar while holding Option — information about the standard will appear (for example, 802.11ac).
    3. On the laptop manufacturer's website in the technical specifications section.
    Can an antivirus affect Wi-Fi speed?

    Yes, and quite significantly. Antiviruses like Kaspersky, ESET NOD32 or Avast scan network traffic in real time, which can reduce speed by 20-40%. Solutions:

    • Add your browser or torrent client to your antivirus exclusions.
    • Disable the "Network Protection" or "Firewall" module in the antivirus settings.
    • Try temporarily uninstalling your antivirus and checking the speed.

    On MacBook can cause a similar problem Little Snitch.

    Is it worth buying a USB Wi-Fi adapter for a laptop?

    This makes sense in three cases:

    1. Your built-in adapter is outdated (for example, it only supports 802.11n).
    2. The laptop antennas are damaged and repairs are expensive.
    3. Do you need Wi-Fi 6 or support 160 MHz channels for games/streaming.

    Recommended models:

    • 🥇 ASUS USB-AX56 (Wi-Fi 6, 5400 Mbps) - for games and 4K streaming.
    • 🥈 TP-Link Archer T4U (Wi-Fi 5, 1300 Mbit/s) - budget option.
    • 🥉 Netgear A7000 (Wi-Fi 5, 1900 Mbit/s) - with external antenna.

    Important: USB adapters 2.0 limited to 480 Mbps, so choose models with USB 3.0 (blue connector).

    How to reset network settings on a laptop?

    Instructions for different OS:

    Windows 10/11:

    1. Open Settings → Network and Internet → Status.
    2. Scroll down and click Network reset.
    3. Confirm the action and restart your laptop.

    macOS:

    1. Open Terminal and run the commands one by one: 
      sudo ifconfig en0 down

      sudo networksetup -removenetworkservice Wi-Fi
      

      sudo networksetup -createnetworkservice Wi-Fi Wi-Fi
      

      sudo ifconfig en0 up

    2. Restart your MacBook.

    After the reset, you will have to re-enter passwords for Wi-Fi networks.