You connected your laptop to a router that distributes the Internet at high speed 300 Mbit/s or 1 Gbit/s, but speed tests show only 50–100 Mbit/s — or worse, is the connection constantly freezing? The problem is not with the provider: if the speed on the phone or other device is normal, the laptop is to blame. In 90% of cases, the problem is solved without replacing the hardware - you just need to find the bottleneck in the Windows settings, drivers or Wi-Fi adapter settings.

In this article we will analyze all possible reasons for limiting Wi-Fi speed on a laptop - from banal overheating of the adapter to hidden energy saving settings that Windows 10/11 turns on by default. You will learn how to check the real speed of the adapter, what router parameters affect performance, and why even a new ASUS ROG or MacBook Pro can “choke” the Internet to the ADSL level. For convenience, we have collected checklists, Wi-Fi standards compatibility tables and step-by-step instructions with commands for the terminal.

1. How to check that the problem is in the laptop

Before delving into the settings, make sure that it is the laptop that is to blame, and not the router or provider. Here 3 quick tests:

  • 📱 Check the speed on your phone (connected to the same Wi-Fi). If on a smartphone 200+ Mbit/s, and on a laptop - 50 Mbit/s, the problem is in the PC.
  • 🔌 Connect the laptop to the router via cable (Ethernet). If the speed increases to 500–900 Mbit/s, the Wi-Fi adapter or its settings are to blame.
  • 🖥️ Test another laptop on the same Wi-Fi. If its speed is normal, your adapter is not working at full capacity.

If all three tests confirm the problem, proceed to diagnostics. If the speed is low on all devices, the router or provider is to blame (this is a separate article).

📊 What is your maximum Wi-Fi speed on your laptop?
  • Up to 50 Mbit/s
  • 50–100 Mbit/s
  • 100–300 Mbit/s
  • More than 300 Mbit/s

2. Hardware limitations: what Wi-Fi adapter does your laptop have?

Many users do not know that maximum Wi-Fi speed depends on the adapter in the laptop. For example, if you have the module installed Intel Wireless-AC 3165, he physically cannot work faster 433 Mbit/s - even if the router supports 1.3 Gbps. And the old standard adapters 802.11n (For example, Broadcom BCM43142) are limited 150 Mbit/s.

To find out your adapter model:

  1. Click Win + X → select Device Manager.
  2. Expand the thread Network adapters.
  3. Find a device with words Wireless, Wi-Fi or Network Adapter.

Compare the model with the table below:

Adapter model Max. speed Wi-Fi standard Frequencies (GHz)
Intel AX200/AX201 2.4 Gbps Wi-Fi 6 (802.11ax) 2.4 / 5
Qualcomm Atheros QCA6174 867 Mbit/s Wi-Fi 5 (802.11ac) 2.4 / 5
Broadcom BCM4352 867 Mbit/s Wi-Fi 5 (802.11ac) 5
Realtek RTL8821CE 433 Mbit/s Wi-Fi 5 (802.11ac) 2.4 / 5
Intel Wireless-AC 3165 433 Mbit/s Wi-Fi 5 (802.11ac) 2.4

If your adapter is older than 2018 and only supports 802.11n, hardware limitation - the only reason for the low speed. Two solutions:

  • 🔧 Buy an external USB adapter (For example, TP-Link Archer T4U for 2–3 thousand rubles).
  • 💻 Replace built-in module (if your laptop allows it, check iFixit).
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If the adapter appears in Device Manager as "Network Controller" with an exclamation point, it means there are no drivers for it. Download them from the laptop manufacturer's website (not from Windows Update!).

3. Router settings that stifle speed

Even if you have a top adapter Intel AX210, the router may artificially limit the speed due to incorrect settings. Here 5 key parameters, which need to be checked in the router web interface (192.168.0.1 or 192.168.1.1):

  • 📶 Wi-Fi mode: must be 802.11ac or 802.11ax (not 802.11n!). On older routers, enable 802.11n/ac mixed.
  • 🔄 Channel width: For 5 GHz set 80 MHz (not 20/40 MHz).
  • 🔒 Security type: only WPA2-AES or WPA3. TKIP or WEP reduce speed by 2–3 times!
  • 📡 Transmission power: install 100% (some routers have a regulator).
  • 🔄 Qos (Quality of Service): Disable or configure manually (automatic QoS often limits traffic).

Pay special attention Wi-Fi channel. If the router is operating on a busy channel (for example, 6 or 11 in the 2.4 GHz band), the speed drops due to interference. Use utilities like Wi-Fi Analyzer (Android) or inSSIDer (Windows) to find an available channel.

How to enable 5 GHz on a router if it is not in the list?

If there is no option to enable 5 GHz in your router settings, then your model does not support it. Check the specifications on the manufacturer's website. For example, budget routers TP-Link TL-WR840N or D-Link DIR-300 work only at 2.4 GHz.

4. Windows drivers and settings that slow down Wi-Fi

Windows 10 and 11 often “optimize” the operation of the Wi-Fi adapter to save energy - and as a result, the speed drops by 30-50%. Here 4 critical settings, which need to be checked:

4.1. Disable adapter power saving

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

4.2. Driver Update

Drivers from Microsoft (installed via Windows Update) often perform worse than the original ones from the manufacturer. Download the latest drivers:

Make sure there is no exclamation mark next to the adapter in Device Manager|

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

Remove the old driver via "Uninstall device"|

Install the new driver and reboot the laptop -->

4.3. Power plan settings

Windows limits Wi-Fi performance by default in Balanced or Energy Saving. To remove a restriction:

  1. Open Control Panel → Power Options.
  2. Choose a plan High performance.
  3. Click Setting up a power plan → Change advanced settings.
  4. Find a section Wireless adapter settings → Power Saving Mode.
  5. Install Maximum performance for both states (battery and mains).

5. Overheating Wi-Fi adapter: the hidden cause of lags

Few people know, but The Wi-Fi adapter in your laptop may overheat - especially in thin ultrabooks (for example, MacBook Air or Dell XPS 13). When overheated, the speed drops to 10–50 Mbit/s, and the connection becomes unstable. You can check the temperature using HWMonitor or AIDA64:

  • 🌡️Normal adapter temperature: 40–60°C.
  • ⚠️ Critical temperature: 70°C and above (the speed begins to “sag”).

If the adapter overheats:

  • 🪟 Provide ventilation: Do not block the laptop vents, use a cooling pad.
  • 🔧 Clean your laptop from dust (especially if he is older than 2 years).
  • 🔄 Unplug the laptop from charging (sometimes the adapter gets hotter when running on mains power).
  • 🛠️ Replace thermal paste (if you disassemble the laptop yourself).
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An overheating Wi-Fi adapter is one of the most underrated causes of slow speeds. If the laptop is hot, and the speed drops after 10-15 minutes of use, the problem is precisely the temperature.

6. External interference and physical obstacles

Even if the router and laptop support Wi-Fi 6, the speed may drop due to external interference. Here's what affects the signal:

  • 📡 Distance to router: every 10 meters reduce speed by 30–50%. Optimal distance - 1–5 meters.
  • 🧱 Obstacles: walls made of concrete or brick reduce speed by 50–70%. The worst thing is metal partitions and mirrors.
  • 📱 Nearby Wi-Fi networks: If there are many routers around on the same channel, interference will occur. Use broadcast analysis utilities (for example, NetSpot).
  • 🔌 Electrical appliances: microwave ovens, cordless phones (DECT), baby monitors operate on the frequency 2.4 GHz and jam Wi-Fi.

Solutions:

  • 📍 Move the router to the center of the apartment (not to the corner!).
  • 🔄 Switch to range 5 GHz (less susceptible to interference).
  • 🛡️ Use Mesh system (For example, TP-Link Deco) for a large house.
  • 📶 Buy repeater (signal repeater) if the router is far away.
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If you have a dual-band router, give the networks different names (for example, MyWiFi_2G And MyWiFi_5G). This way you can manually select the band on your laptop.

7. Viruses, VPNs and background programs

Sometimes the speed drops not because of the adapter or router, but because software. Here's what can slow down the Internet:

  • 🦠 Viruses and mining bots: Some viruses use your Wi-Fi for DDoS attacks or mining. Check the system Malwarebytes or Kaspersky Virus Removal Tool.
  • 🔒 VPN services: Even paid VPNs (eg. NordVPN or ExpressVPN) can reduce speed by 30–70%. Disable your VPN and check your speed.
  • 📥 Background updates: Windows, Steam, NVIDIA GeForce Experience or Epic Games can download gigabytes in the background. Open Task Manager → tab Network.
  • 🛡️ Firewall or antivirus: sometimes Avast, ESET NOD32 or built-in Windows Defender block traffic. Try disabling them temporarily.

To find a "gluttonous" application:

  1. Open Task Manager (Ctrl + Shift + Esc).
  2. Go to the tab Performance → Wi-Fi.
  3. See which app is using the most traffic.
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If the speed drops only in certain programs (for example, in a browser or game), the problem lies with them. Try updating the software or reinstalling.

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

🔍 Why is the speed via Wi-Fi lower than via cable?

This is normal: Wi-Fi is always slower than Ethernet due to interference, latency, and limitations of the standard. For example, even Wi-Fi 6 (802.11ax) in practice gives the maximum 1–1.5 Gbit/s, while gigabit Ethernet stably produces 900–950 Mbit/s. If the difference is greater 30–40%, look for the problem in the settings.

💻 Is it possible to speed up Wi-Fi on an old laptop (2015–2017)?

Yes, but with restrictions:

  • If the adapter supports 802.11ac, update the drivers and router settings (channel width 80 MHz, mode ac).
  • If the adapter is older (802.11n), buy an external USB adapter (for example, TP-Link Archer T3U for ~1.5 thousand rubles).
  • Disable power saving in Windows settings (see section 4).

The maximum speed on older laptops rarely exceeds 300–400 Mbit/s.

⚡ Why does the speed drop in the evening?

In the evening, the network load increases due to:

  • 📡 Router channel congestion (neighbors actively use Wi-Fi).
  • 🌐 Provider server load (especially relevant for Rostelecom or Beeline).
  • 🎮 Online games and streams (Netflix, Twitch, Steam take the lion's share of traffic).

Solution: Switch to 5 GHz (less busy) or use QoS in the router settings to prioritize traffic.

🔄 How to reset Wi-Fi settings on a laptop?

To reset network settings in Windows:

netsh winsock reset

netsh int ip reset


ipconfig /flushdns

Then restart your laptop. If it doesn't help, delete the network in the Wi-Fi settings and connect again.

🛠️ Is it worth changing the Wi-Fi adapter in your laptop?

Replacement makes sense if:

  • Your current adapter is older than 2018 (802.11n or 802.11ac at speeds up to 433 Mbit/s).
  • The laptop supports replacement (check at iFixit).
  • Are you ready to spend 2–5 thousand rubles. to a new module (for example, Intel AX200).

For most users it is cheaper and easier to buy external USB adapter (For example, ASUS USB-AC68).

💡

If you have tried all the methods and the speed is still low, the problem may be with your ISP. Call support and ask them to check the line for packet loss (ping with losses >5% - a sign of malfunction).