Introduction: Why a laptop is throttling its Wi-Fi speed

Have you noticed that on a smartphone pages load instantly, but on a laptop it’s as if in a second? 90's dial-up? This is a typical situation when Wi-Fi adapter not working at full capacity. There can be a dozen reasons - from banal overheating to hidden router settings that even experienced users are not aware of.

According to research NetSpot, in 63% of cases the problem lies not in the provider, but in the device itself or its configuration. For example, laptops with dual-band adapters (2.4 GHz + 5 GHz) often get stuck on an overloaded 2.4 GHz channel, losing up to 70% of speed. And the owners MacBook Pro 2018–2020 are faced with a bug in the driver Broadcom BCM43xx, which limits the speed to 50 Mbps.

In this article we will analyze all possible reasons - from hardware to software - and we will provide checklists for diagnostics. You will learn how to check in 10 minutes whether the router, the driver, or the laptop itself is at fault, and what to do if the speed “sags” on only one device.

1. Checking the actual speed: is your laptop cheating you?

Before digging into the settings, make sure that there really is a problem. Do three tests:

  1. Test on a laptop through Speedtest or Fast.com (run 2-3 times and record the average).
  2. Test on another device (smartphone, tablet) on the same network.
  3. Test via cable (if it is possible to connect the laptop to the router via Ethernet).

If the cable speed is normal, but the Wi-Fi speed is low, the problem is in the wireless adapter or its settings. If it is slow on all devices, the router or provider is to blame.

📊 What is the Wi-Fi speed on your laptop?
  • Up to 10 Mbit/s
  • 10–50 Mbit/s
  • 50–100 Mbit/s
  • More than 100 Mbit/s
  • I don't know

Critical indicators, which are worth paying attention to:

  • 📉 Ping above 100ms - lags in games and delays when loading pages.
  • 🐢 Speed below 10 Mbps at a tariff of 100 Mbit/s - a clear signal of a problem.
  • 🔄 Speed fluctuations (either 50 Mbit/s or 2 Mbit/s) is a sign of interference or an unstable driver.
⚠️ Attention: If you are using a VPN, disable it before the test. Services like NordVPN or ProtonVPN can artificially reduce speed by 30–50%.

2. Hardware reasons: when the hardware adapter is to blame

If the laptop is older than 5 years, there is a high chance that it Wi-Fi module It just doesn't live up to modern standards. For example, adapters that only support 802.11n (up to 300 Mbit/s) will “slow down” on the network with 802.11ac (up to 1.3 Gbit/s).

How to check the standard of your adapter:

  1. On Windows: open Device Manager → Network adapters → find the Wi-Fi module model (for example, Intel Wireless-AC 9560).
  2. On macOS: About this Mac → System report → Network → Wi-Fi.
  3. Google the adapter model + “maximum speed”.
Wi-Fi standard Max. speed Year of manufacture Example of adapters
802.11a/b/g up to 54 Mbit/s 1999–2003 Broadcom BCM4311, Atheros AR5007
802.11n up to 300–450 Mbit/s 2009–2013 Intel Centrino 6205, Qualcomm Atheros AR9485
802.11ac (Wi-Fi 5) up to 1.3 Gbit/s 2013–2019 Intel Wireless-AC 9260, Killer 1550
802.11ax (Wi-Fi 6) up to 9.6 Gbit/s 2019–present time Intel AX200, Qualcomm FastConnect 6800

What to do if the adapter is out of date?

  • 🔌 Buy USB Wi-Fi adapter (For example, TP-Link Archer T4U for 1.5 thousand rubles. Wi-Fi enabled 5).
  • 🖥️ Replace the built-in module (in most laptops it is removable, but you need a compatible model).
  • 📡 Connect to the router via cable (if possible).
How to find out if the Wi-Fi module in your laptop is removable?

Open the back cover (or look in the user manual) - if you see a small board with antennas and a connector M.2 2230 or NGFF, it can be replaced. In soldered modules (for example, in MacBook Air M1) replacement is not possible.

3. Software problems: drivers, Windows/macOS settings and background processes

In 40% of cases, slow Wi-Fi on a laptop is due to outdated drivers or incorrect energy saving settings. Let's look at it step by step.

3.1. Update Drivers (Windows)

An outdated driver may limit the speed to 54 Mbit/s even on a modern adapter. How to update:

  1. Open Device Manager (Win + X → Device Manager).
  2. Expand Network adapters, find your Wi-Fi module.
  3. RMB → Update driver → Automatic search.
  4. If Windows says the driver is up to date, download it manually from the manufacturer's website (for example, for Intel — here).

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

Download the driver from the official website (NOT from driver packs)|

Reboot the laptop after installation|

Check the driver version in the adapter Properties (must match the latest one on the website) -->

3.2. Energy Saving Settings (Windows)

Windows by default limits the power of the Wi-Fi adapter to save battery. How to disable:

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

On macOS a similar problem can be solved by resetting SMC (for Intel Mac) or NVRAM:

1. Выключите Mac.

2. Нажмите и удерживайте клавиши Control + Option + Shift + кнопку питания в течение 7 секунд.


3. Включите Mac.

⚠️ Attention: On MacBook Pro/Air with M1/M2 chips Resetting the SMC is not required - instead, update macOS to the latest version (Wi-Fi bugs are often fixed in patches).

3.3. Background processes and viruses

If the laptop simultaneously downloads torrents, synchronizes the cloud, or is infected with miners, the Wi-Fi speed will drop. How to check:

  • 🔍 Open Task Manager (Ctrl + Shift + Esc) → tab Network. If some application “eats” traffic, close it.
  • 🛡️ Conduct a virus scan (Malwarebytes or built-in Windows Defender).
  • ⚙️ Disable automatic game updates in Steam/Epic Games and cloud synchronization (Google Drive, OneDrive).

4. Router settings: channels, standard and network congestion

Even if the laptop is fine, incorrect router settings can “choke” speed. For example, if the router is operating in mode 802.11b/g, the maximum speed will be limited 54 Mbit/s - even for devices with support 802.11ac.

How to optimize your router:

  1. Go to your router control panel (usually at 192.168.0.1 or 192.168.1.1, login/password on the sticker below).
  2. Check the following settings:
Parameter Recommended value Why is this important
Wireless Mode (Mode) 802.11a/n/ac or 802.11ax Mode b/g limits speed to 54 Mbps.
Channel Width 40 MHz (for 5 GHz) or 80 MHz (if supported) Narrow channel (20 MHz) reduces the speed by 2–4 times.
Channel Auto or manual selection (eg 36, 40, 44 for 5 GHz) Overloaded channels (for example, 1, 6, 11 at 2.4 GHz) slow down communication.
MTU 1500 (standard) or 1472 (if there are problems) Incorrect MTU leads to packet fragmentation and lags.

How to choose a free channel:

  • 📊 Use utilities like Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS) for broadcast scanning.
  • 🎯 Select a channel with minimal load (5 GHz is usually freer).
  • 🔄 Reboot your router after changes.
💡

If you have a dual-band router, give the networks different names (for example, MyWiFi_2G And MyWiFi_5G) and connect your laptop to 5 GHz - there is less interference and higher speed.

5. Interference and physical obstacles: why the signal is “lost”

Walls, microwave ovens and even neighboring routers can reduce Wi-Fi speed by 30–70%. For example, a 30 cm thick concrete wall weakens the signal by 10–15 dB, and the operating microwave is at a frequency 2.4 GHz creates interference on all channels in this range.

How to reduce interference:

  • 📡 Move the router to the center of the apartment, raise it higher (on a closet or shelf).
  • 🚫 Remove metal objects, mirrors and aquariums from the router (water absorbs the signal).
  • 🔌 If possible, connect your laptop to the router via cable (even temporarily for testing).
  • 🛠️ Use repeater (signal repeater) or Mesh system (For example, TP-Link Deco), if the apartment area is more than 70 m².

Interference test:

  1. Disconnect all devices from the router except the laptop.
  2. Turn off the microwave, cordless phones (DECT), and Bluetooth speakers.
  3. If the speed has increased, interference is to blame.
💡

In apartment buildings, the least loaded channels in the 5 GHz range are from 36 to 48 and from 149 to 165. In 2.4 GHz there are almost never free channels.

6. Problems with the provider: how to distinguish your jambs from theirs

Sometimes it’s not the laptop or the router that’s to blame, but provider. For example, if you have a tariff 100 Mbit/s, but in fact it is issued 30 Mbit/s, it could be:

  • 📉 Throttling (artificial speed limit after exceeding the traffic limit).
  • 🔌 Problems on the line (damaged cable, malfunction of the provider’s equipment).
  • 📡 Network congestion during rush hours (in the evening the speed can drop by 40%).

How to check your provider:

  1. Connect your laptop directly to the provider's cable (bypassing the router). If the speed is just as low, the problem is on their side.
  2. Call support and ask to check signal level (for ADSL/GPON) or port loading.
  3. Use the service Bing Speed Test — it shows speed without caching (unlike Speedtest).
⚠️ Attention: If the provider promises 100 Mbit/s, and via cable you get 90–95 Mbit/s - this is normal (losses due to protocols). But if less 70 Mbit/s - demand a trial.

7. Specific problems: MacBook, games, VPN and more

Some laptops and use cases have unique bugs, which few people know about. Let's look at the most common ones.

7.1. MacBook: bugs with Wi-Fi on M1/M2 and Intel chips

Owners MacBook Pro/Air on Apple Silicon (M1/M2) often encounter:

  • 🍏 Disabling Wi-Fi after sleep - turning off the function helps Private Wi-Fi Address (System Settings → Wi-Fi → ⚙️ → uncheck).
  • 🐢 Low speed on 5 GHz - update macOS to the latest version (in Sonoma 14.3+ bugs fixed Broadcom chips).

7.2. Gaming Laptops: Killer Networking and Gaming Lags

Adapters Killer Wireless (installed in MSI, Alienware, some ASUS ROG) are known for prioritize traffic and can “choke” speed for background traffic. How to fix:

  1. Remove Killer Control Center through Control panel → Programs.
  2. Download standard drivers for your adapter from the website Intel or Qualcomm.
  3. Disable Killer Bandwidth Control in Windows Services (services.msc).

7.3. VPN and proxies: why speed drops by 2–5 times

Using a VPN (NordVPN, ExpressVPN) or proxy servers may reduce speed by 40–80% due to:

  • 🌍 Remote server (the further you go, the higher the ping).
  • 🔒 Encryption (AES-256 increases CPU load).
  • 🚦 Provider restrictions (some block VPN traffic).

How to reduce speed loss:

  • 📍 Connect to servers in your country or neighboring countries.
  • 🔄 Try the protocol WireGuard instead of OpenVPN (he's faster).
  • ⚡ Disable VPN for local resources (for example, for games via Split Tunneling).

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

❓ Why is Wi-Fi fast on the phone, but slow on the laptop?

This is a typical situation when:

  • The laptop is connected to an overloaded range 2.4 GHz, and the phone - to 5 GHz.
  • The laptop has an outdated driver or the power saving mode for Wi-Fi is enabled.
  • The laptop adapter is older and does not support modern standards (for example, 802.11n vs 802.11ac on the phone).

Solution: Force your laptop to connect to the network 5 GHz (if the router is dual-band) and update the driver.

❓ How to find out which Wi-Fi adapter is installed in your laptop?

On Windows:

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

On macOS:

  1. Click on the icon Wi-Fi in the menu bar while holding down the key Option.
  2. Or open System report (About this Mac → System report → Network).
❓ Can an antivirus slow down Wi-Fi?

Yes, some antiviruses (Kaspersky, Avast, ESET) scan network traffic in real time, which can reduce speed by 10–30%. What to do:

  • Disable the feature Firewall or Traffic protection in the antivirus settings.
  • Add your browser or game to exceptions.
  • Try a different antivirus (for example, Bitdefender less impact on the network).
❓ Why is Wi-Fi slow only in the evenings?

This is due to:

  • 📈 Provider network overload (during peak hours the speed may drop by 30–50%).
  • 📡 Interference from neighbors (in the evening everyone is on the Internet, and channels 2.4 GHz are overloaded).
  • 🎮 Online games or streams (if anyone on your network is watching Netflix in 4K or playing in Fortnite, this “eats” the channel).

Solution: Switch to 5 GHz, try a different DNS (for example, 1.1.1.1 or 8.8.8.8), or negotiate with your provider to increase the tariff.

❓ How to reset network settings on a laptop?

On Windows 10/11:

1. Откройте Параметры → Сеть и Интернет → Состояние.

2. Нажмите Сброс сети → Сбросить сейчас.


3. Перезагрузите ноутбук.

On macOS:

1. Откройте Терминал (Programs → Utilities → Terminal).

2. Введите команды:


sudo ifconfig en0 down


sudo rm /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist


sudo rm /Library/Preferences/SystemConfiguration/preferences.plist


sudo ifconfig en0 up


3. Перезагрузите Mac.

⚠️ After resetting, you will have to re-enter passwords for Wi-Fi networks.