You are sitting with a laptop a meter from the router, and the pages are loaded like through dial-up of the 2000s, while the phone is on the same Wi-Fi shows 300 Mbps. Is this a familiar situation? Slow internet speed on a laptop is one of the most annoying problems that can occur even on top models Dell XPS, MacBook Pro or ASUS ROG. In 90% of cases, it is not the provider or the router that is to blame, but the settings of the device itself, outdated drivers or hardware limitations.

This article is not about trivial advice like “reboot your router.” We'll sort it out unique reasons for speed drops on laptops - from channel conflict 5 GHz/2.4 GHz to hidden Windows power saving settings that throttle the adapter. You will also learn how to check in 5 minutes whether your brakes are at fault. Intel AX200, Qualcomm Atheros or Broadcom adapter - and what to do with it.

1. Checking real speed: why tests lie

Before digging into the settings, you need to understand where exactly is the speed lost?. Most users limit themselves to tests on Speedtest.net or Yandex.Internetometer, but these services often show inflated numbers. Here's how to check the speed correctly:

Open Command line (Win + R → enter cmd) and do:

ping -n 20 8.8.8.8

If you see in the results time=1ms for most packages, but the pages load slowly - the problem is DNS or browser. If the ping varies from 50ms to 500ms, either the router or interference on the air is to blame.

  • 📊 Test 1: Connect your laptop to the router via cable. If the speed has increased by 5-10 times, the problem is Wi-Fi adapter or its settings.
  • 📱 Test 2: Run a speed test on your laptop and phone simultaneously (on the same server!). If the difference is more than 30%, look for a problem in the laptop.
  • 🔄 Test 3: Reboot your router and immediately check the speed. If after the reboot it increased, but after 10 minutes it fell again - it’s your fault chip overheating router.
⚠️ Attention: If your laptop shows connection speed 72 Mbit/s (standard 802.11n) instead 866 Mbit/s (802.11ac), the problem is adapter operating mode. This is typical for old drivers or incorrect router settings.
📊 What laptop do you have?
  • ASUS
  • Lenovo
  • HP
  • Dell
  • Apple MacBook
  • Acer
  • MSI
  • Other

2. Wi-Fi drivers: why updating doesn’t always help

Outdated drivers are the first thought when Wi-Fi is slow. But there's a catch: sometimes new drivers from the manufacturer They work worse than the old ones. For example, adapters Intel AX200/AX201 often conflict with driver versions 22.200+, and Qualcomm Atheros May be buggy with firmware newer than 2021.

How to check and update the driver correctly:

  1. Click Win + X → Device Manager → open Network adapters.
  2. Find your Wi-Fi module (for example, Intel(R) Wi-Fi 6 AX200).
  3. Right click → Properties → tab Driver.
  4. Remember driver version And release date.

Now compare it with the latest versions on the manufacturer’s website:

  • 🔗 Intel: official page
  • 🔗 Qualcomm/Atheros: drivers are searched by laptop model (for example, on the website Lenovo or HP).
  • 🔗 Broadcom: Drivers often come via Windows Update.

If after the update the speed drops even more - roll back to the previous version. To do this, in the same driver properties window, click Rollback. If the button is inactive, download the old version manually and install it via Update driver → Search for drivers on this computer.

I found out the adapter model in Device Manager|

I compared the driver version with the official one|

Tested the speed before and after the update|

If necessary, rolled back to the old version -->

3. Energy Saving Settings: Why Windows is Choking Your Wi-Fi

Windows by default limits the power of the Wi-Fi adapter to save battery power. As a result, the speed may drop by 2-3 times, especially on laptops with Intel or Realtek chips. Here's how to fix it:

  1. Open Control Panel → Power Options.
  2. Click Setting up the power plan next to the active plan.
  3. Select Change advanced power settings.
  4. Expand Wireless adapter settings → Power saving mode.
  5. Install Maximum performance for both states (battery and mains).

For adapters Intel There is another hidden setting: 

netsh interface set interface "Wi-Fi" admin=enable

This command disables automatic adapter shutdown when idle. Enter it in Command line on behalf of the administrator.

Adapter manufacturer Typical problem Solution
Intel (AX200, 9260, 8265) Speed drop when running on battery power Disable power saving in power settings + update driver to 22.190.0 or newer
Qualcomm Atheros (QCA61x4, QCA9377) Packet loss on 5 GHz Disable 802.11r Fast Transition in the router settings
Realtek (RTL8821CE, RTL8188EE) Low speed at 2.4 GHz (<30 Mbps) Install the driver from the laptop manufacturer's website (not from the official Realtek website!)
Broadcom (BCM43xx) Frequent disconnections Disable Bluetooth Collaboration in adapter settings
⚠️ Attention: On laptops Lenovo And HP Modified Wi-Fi drivers are often installed. Installing “clean” drivers from the website Intel or Qualcomm may lead to loss of functionality (for example, Fn buttons to control the network). Always download drivers from the laptop manufacturer's website!

4. Channel conflict and interference: why neighbors steal your speed

If your router and laptop support 5 GHz, but the connection occurs on 2.4 GHz - you lose up to 80% speed. The reason may be:

  • 📡 Automatic channel selection router (often chooses an overloaded one).
  • 🔌 Outdated router firmware (especially relevant for TP-Link And D-Link older than 2019).
  • 🍳 Interference from household appliances (microwaves, cordless phones, CCTV cameras).

How to check and fix:

  1. Install the application on your phone WiFi Analyzer (Android) or NetSpot (iOS/macOS).
  2. See what channels 2.4 GHz And 5 GHz Least loaded in your home.
  3. Go to your router settings (usually 192.168.0.1 or 192.168.1.1) and manually set a free channel.

For 5 GHz choose channels 36-48 or 149-165 (they are less susceptible to interference). For 2.4 GHz - only 1, 6 or 11 (they don't intersect). If your router does not see channels 149+, it means it doesn't support DFS - this is typical for budget models Tenda or Mercusys.

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If after changing the channel the speed is still low, try disabling the option in the router settings Auto Channel Selection And Band Steering (if any). These functions often perform worse than manual settings.

5. Hardware limitations: when a laptop does not support modern Wi-Fi

If your laptop was released before 2018, there is a good chance that its Wi-Fi adapter is simply does not support modern standards:

  • 🖥️ Adapters up to 2015 (For example, Intel 7260, Broadcom BCM43142) are usually limited 802.11n (max. 150 Mbit/s).
  • 🔄 Adapters 2016-2017 (Intel 8260, Qualcomm QCA6174) support 802.11ac, but only on 1 stream (max. 433 Mbit/s).
  • ⚡ Modern adapters (Intel AX200, Killer Wi-Fi 6) give 2.4 Gbps, but only when connected to a router with Wi-Fi 6.

You can check the maximum speed of your adapter like this:

  1. Open Device Manager → find your Wi-Fi adapter.
  2. Right click → Properties → tab Additionally.
  3. Look for options like Wireless Mode, 802.11n/ac Wireless Mode or Preferred Band.

If there is no mention in the settings 802.11ac or Wi-Fi 5/6, your adapter is in mode 802.11n. In this case, even when connected to a router ASUS RT-AX88U you won't get any more 150-300 Mbit/s.

How to update the Wi-Fi adapter on a laptop?

If your adapter is old, you can replace it. Most laptops (except MacBook and some ultrabooks) have a removable module M.2 2230 or NGFF. Popular models for upgrade:

- Intel AX210 (Wi-Fi 6E, up to 2.4 Gbps, ~3000₽)

- Killer AX1650 (low pings for gamers, ~4500₽)

- Broadcom BCM4375 (good compatibility with macOS, ~5000₽)

Before purchasing, check whether your laptop supports adapter replacement (look for information on the model + "Wi-Fi upgrade").

6. Software conflicts: antiviruses, VPNs and hidden processes

Sometimes slow Wi-Fi is not a network problem, but a consequence background processes. Here's what can slow down your connection:

  • 🛡️ Antiviruses (especially Kaspersky, Avast, ESET) scan all traffic, adding delay.
  • 🌍 VPN services (For example, NordVPN, ProtonVPN) can limit speed to 50-70 Mbit/s even at the "maximum speed" tariff.
  • 🖥️ Windows Updates or macOS in the background (can eat up to 50% of the channel).
  • 🎮 Streaming services (Netflix, Twitch, YouTube in 4K) automatically limit the speed for other devices.

How to diagnose:

  1. Open Task Manager (Ctrl+Shift+Esc) → tab Network.
  2. Sort processes by Using the network.
  3. If some process constantly loads the network to 10-50 Mbit/s - this is your culprit.

Solutions:

  • For antiviruses: add a browser exception or disable Network scanner in the settings.
  • For VPN: try changing the protocol (for example, from OpenVPN on WireGuard).
  • For Windows: Turn off background updates in Settings → Update & Security → Advanced Options → Delivery Optimization.
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If, after disabling all background processes, the speed increases, but not to the maximum, the problem is combinations of several factors (for example, old driver + energy saving + interference from neighbors).

7. Rare causes: from overheating to viruses

If none of the above helps, check these exotic causes:

  • 🔥 Wi-Fi adapter overheating: some laptops (eg MSI GS66 or ASUS TUF) have poor cooling for the network card. View the temperature via HWMonitor - if the adapter heats up higher 70°C, this can cause speed drops.
  • 🦠 Network viruses: some Trojans (for example, DNSChanger) redirect traffic through a proxy, which reduces speed. Get checked Malwarebytes or AdwCleaner.
  • 📦 BIOS/UEFI settings: On some laptops (especially Dell Latitude And HP EliteBook) there is an option in the BIOS Wireless LAN Radio Control - if it is disabled, Wi-Fi will work at a reduced speed.
  • 🔌 Faulty USB port: If you are using an external Wi-Fi adapter (for example, TP-Link TL-WN823N), try connecting it to a different port - unstable power supply may cause sags.

To check if the adapter is overheating:

  1. Install HWMonitor or AIDA64.
  2. Find your Wi-Fi adapter in the list (may be called Network Controller).
  3. If the temperature is higher 65°C in idle time or 85°C under load - the adapter overheats.

Overheating solutions:

  • Blow out the laptop with compressed air (especially the area near the Wi-Fi adapter, usually under the keyboard on the right).
  • Use a cooling pad with fans.
  • If the adapter is built-in, reduce Transmit Power in its settings (in Device Manager → Properties → Advanced).

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

❓ Why is Wi-Fi speed lower on a MacBook than on a Windows laptop?

MacBooks are often speed limited due to:

  • 🍎 Old drivers: Apple rarely updates firmware for Wi-Fi adapters (especially in older models).
  • 🔒 "Private Wi-Fi Address" functions (changes the MAC address, which may conflict with the router). Disabled in network settings.
  • 📡 Lack of support 160 MHz: Even new MacBooks often only run on 80 MHz, which limits the speed to 1.2 Gbps instead of 2.4 Gbps.

Solution: Update macOS to the latest version or use an external adapter (such as TP-Link Archer T4U).

❓ Could slow Wi-Fi be due to a virus?

Yes, some viruses affect speed:

  • 🕵️ DNS redirectors (For example, DNSUnlocker) redirect traffic through proxy servers.
  • 🖥️ Miners (For example, WannaMine) use your channel to mine cryptocurrency.
  • 📤 Botnets (For example, Mirai) may send spam or engage in DDoS attacks.

Get checked Malwarebytes and look in Task Manager, whether there are any suspicious processes with high network traffic.

❓ Why does the speed drop only in the evenings?

This is a typical problem overloaded channel. Reasons:

  • 🏘️ Neighbors: in the evening everyone is online, and the channels 2.4 GHz are overloaded. The solution is to switch to 5 GHz.
  • 📶 Provider policy: some operators (for example, Rostelecom or MTS) throttle the speed during peak hours. Check via Speedtest on different servers.
  • 🔄 Problems with DHCP: If the router distributes IP addresses slowly, the connection may slow down with each new session. Solution: Set a static IP for your laptop.
❓ How to check if my laptop supports Wi-Fi 6?

There are 3 ways:

  1. Device Manager → find the adapter → if there is one in the name AX (For example, Intel AX200) is Wi-Fi 6.
  2. Look at the laptop's specifications on the manufacturer's website (look for 802.11ax).
  3. Install WiFi Explorer (macOS) or NetSpot (Windows) - the program will show supported standards.

Even if the adapter supports Wi-Fi 6, for full speed you need a router with 802.11ax (For example, ASUS RT-AX86U or TP-Link Archer AX6000).

❓ Does replacing antennas in a laptop help?

Replacing antennas may help if:

  • 📶You have weak signal (1-2 bars in the tray), but the router is far away.
  • 🖥️ The laptop has cheap antennas (typical for budget models Acer or Lenovo Ideapad).
  • 🔧 You disassembled the laptop and saw that the antennas were oxidized or damaged.

Antennas with a connector are suitable for most laptops. IPEX MHF4. Popular models:

  • Intel 100mm Wi-Fi Antenna (~500₽)
  • TP-Link TL-ANT2408CL (external, ~1500₽)

⚠️ Warning: Replacing antennas requires disassembling the laptop and may void the warranty!