Slow WiFi on Windows 10: Why is my wireless network speed slower than my cable connection?

You've connected your laptop or PC to WiFi, but the internet speed is disappointing: pages take forever to load, videos are slow, and online games are laggy. Meanwhile, the cable connection works fine, while the WiFi works fine on your phone or tablet. What's wrong? Windows 10 is known for issues with network adapter drivers, conflicting power-saving settings, and suboptimal TCP/IP settings. But the OS isn't always to blame—often the root cause lies in the router, interference, or even the physical placement of devices.

In this article we will look at All possible reasons for slow WiFi speed on Windows 10 — from a simple outdated driver to hidden router settings not mentioned in the manuals. You'll learn how to diagnose the problem, which settings should be changed first, and when it's time to consider replacing the equipment. And at the end, an FAQ with answers to the most frequently asked questions.

Let us warn you right away: if you have an old laptop with a WiFi 4 (802.11n) adapter or a cheap USB dongle, the maximum wireless speed is physically limited to 150–300 Mbps. Even under ideal conditions, you won't get gigabit speeds like you would with a cable. But if your adapter supports it, WiFi 5 (802.11ac) or WiFi 6 (802.11ax), but the speed is still below 100 Mbps - read on.

1. Real Speed ​​Test: Don't Blame Your WiFi Prematurely

Before messing with the settings, make sure the problem is with your wireless connection. Use services like Speedtest or FAST.com, but take into account the nuances:

✅ Test on different devicesIf the speed is normal on your smartphone but not on your PC, the adapter or its settings are to blame. If the speed is low across the board, the problem lies with your router or ISP.

✅ Compare with cable connectionConnect your computer to the router via Ethernet and run the test again. If the difference is more than 2-3 times, look for a WiFi issue.

✅ Test under different conditions:

• 📶 Next to the router (1–2 meters) – to avoid interference and weak signal.
• 🖥️ On another PC/laptop — to understand whether the problem is local or systemic.
• 🕒 At different times of the day — the channel may be overloaded by neighboring networks.

⚠️ Attention: If your WiFi speed is consistently below 10 Mbps, but your cable connection speed is 100+ Mbps, the problem is almost certainly with the adapter, drivers, or Windows settings. If the difference is minor (for example, 70 Mbps over the air vs. 90 Mbps over the cable), this is normal—losses in wireless transmission are inevitable.

2. Network adapter driver: update or roll back

In 80% of cases, slow WiFi on Windows 10 is related to outdated, corrupted, or incompatible drivers. Adapter manufacturers (eg Intel, Qualcomm Atheros, Realtek) regularly release updates that fix bugs and improve performance. But sometimes, new versions can actually break things—especially if you've updated Windows to the latest build.

How to check and update the driver:

1. Click Win + X → select device Manager.
2. Expand the branch Network adapters.
3. Find your WiFi adapter (usually has " in the name Wireless, Wi-Fi or 802.11).
4. Right click → Update driver → Automatic search.

If Windows reports that the driver is up to date, but the problem persists:

• 🔍 Install the driver manually from the website of the adapter or laptop manufacturer (for example, for Dell, HP, Lenovo there are separate support pages).
• 🔄 Driver rollback: in the same menu, select Properties → Driver → Roll Back Driver (if the button is active).
• 🧹 Remove the driver completely and restart your PC - Windows will reinstall it.

⚠️ Attention: If after updating the driver WiFi stops working completely, use system restore point (Win + R → rstrui). Some drivers (especially for older adapters) Realtek RTL8188 or Broadcom) may conflict with the latest Windows updates.

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

Remove the old driver via Device Manager

Disable automatic driver updates in Windows

Restart your PC after installation-->

3. Power Settings: Why Windows Throttles WiFi

Windows 10 is optimized for energy saving by default, especially on laptops. One of its features is Automatically reduce the power of the WiFi adapter, when your PC is running on battery power. This can reduce speed by 30-50%! Even if you're connected to the internet, some power plans maintain these restrictions.

How to disable power saving for WiFi:

1. Open Control Panel → Power Options.
2. Opposite the active scheme, click Setting up a power plan.
3. Select Change advanced power settings.
4. Find the section Wireless Network Adapter Settings → Power saving mode.
5. Install Maximum performance for both states (battery and mains).

If this item is not in the settings:

• 🔧 Update your adapter driver — sometimes the parameter appears after installing a new version.
• 🔌 Check in BIOS: on some laptops (eg. ASUS or MSI) there is an option Wireless Radio Control, which can limit power.

⚠️ Attention: On some adapters (eg. Intel AX200/AX201) there is a separate utility Intel PROSet/Wireless Software, where you can fine-tune energy saving settings. If it's installed, check its settings—sometimes they override the system settings.

4. TCP/IP and DNS parameters: hidden bottlenecks

Windows 10 uses legacy TCP/IP settings by default, which can limit speeds, especially on fast connections (100+ Mbps). Furthermore, if your ISP or router supports IPv6, and in the system it is disabled (or vice versa), this can cause delays.

TCP/IP optimization:

1. Open Control Panel → Network and Internet → Network and Sharing Center.
2. Click on WiFi connection → Properties.
3. Uncheck the box Internet Protocol version 6 (TCP/IPv6), if you don’t use it (check with your provider).
4. Select Internet Protocol version 4 (TCP/IPv4) → Properties → Additionally.
5. Tab Parameters: turn off Automatic metric tuning and install Automatic level selection.

Changing DNS (if websites load slowly, but the test speed is normal):

• 🌍 In the same properties IPv4 Specify DNS manually:

  8.8.8.8
  8.8.4.4

  (Google Public DNS) or

  1.1.1.1
  1.0.0.1

  (Cloudflare).

• 🔄 After the changes, run in the command line (Win + R → cmd):

  ipconfig /flushdns

Critical note: If you have a provider with MAC address locking (e.g., Rostelecom or Beeline), changing your DNS may disrupt your internet access. In this case, use your provider's DNS.

netsh interface ipv4 set subinterface "Connection_Name" mtu=1472 store=persistent

5. Router settings: channel, width, WiFi standard

Even if WiFi is fast on other devices, incorrect router settings can choke speed on Windows 10 specifically. Key parameters worth checking:

1. WiFi operating mode (802.11 standard):

• 📶 If the router supports WiFi 6 (802.11ax), but it's in the settings 802.11b/g/n, you lose up to 50% speed.
• 🔄 The best option is 802.11n/ac/ax (if the adapter supports it). For older devices - 802.11n.

2. Channel and channel width:

• 📡 In urban areas, channels 1–6 usually overloaded. Try 11–14 (if they are allowed in your country).
• 📊 Channel width 20/40 MHz — a compromise between speed and stability. For WiFi 5/6 can be exhibited 80 MHz, but this will increase interference.

3. Region and transmission power:

• 🌐 Check your router settings Region - If the country is not yours, there may be channel restrictions.
• 📞 Some routers (for example, ASUS RT-AX88U or TP-Link Archer C7) allow to increase transmit power (parameter Tx Power). Optimally - High or 100%.

📌 Table of optimal router settings for maximum speed:

⚠️ Attention: If you have a dual-band router (2.4 GHz + 5 GHz), connect Windows 10 to the network 5 GHz — there's less interference and higher speed. But remember: walls and ceilings weaken the 5 GHz signal more than the 2.4 GHz signal.

6. Interference and physical obstacles: why the signal “drops”

Even the most advanced router is useless if there's a concrete wall, a microwave, or neighboring WiFi networks on the same channel between it and your PC. Physical interference can reduce speed by 5-10 times!

How to check and eliminate interference:

• 📡 Ether analysis: use programs like WiFi Analyzer (Android) or inSSIDer (Windows) to see channel occupancy. If there are 10+ nearby networks on channel 6, change it.
• 🏠 Router location:

  - Do not place it in a corner, behind a TV or in a closet.

  - Optimally - at a height of 1–1.5 meters, in the center of the apartment.

  - Avoid proximity to microwaves, cordless telephones, and wireless speakers.

• 🔄 Change of range: If there is a lot of interference on 2.4 GHz, switch to 5 GHz (but keep in mind the shorter range).
• 📶 Signal amplifiers: if the router is far away, use repeater (For example, TP-Link RE605X) or Mesh system (For example, Google Nest WiFi).

💡 Helpful tip: If you have dual-band router, give the 2.4 GHz and 5 GHz networks different names (For example, MyWiFi_2G And MyWiFi_5G). This way, Windows 10 won't automatically switch to a slower range.

7. Program and service conflicts: who is stealing your WiFi?

Some Windows programs and services may limit internet speed or create a background load. Common culprits:

• 🛡️ Antiviruses (For example, Kaspersky, Avast) - their firewalls can slow down traffic.
• 🔄 Windows Updates - if they are downloaded in the background.
• 🎮 Streaming services (For example, Steam, NVIDIA GeForce Experience) - may limit the channel width.
• 📥 Torrents — even in an inactive state, some clients (for example, uTorrent) occupy connections.

How to find and resolve a conflict:

1. Open Task Manager (Ctrl + Shift + Esc) → tab Net.
2. Check which programs are consuming your bandwidth. If anything looks suspicious, terminate the process.
3. Temporarily disable Windows Firewall And antivirus, then check the speed again.
4. If the speed has increased, set up exclusions in your antivirus for your programs.

⚠️ Attention: If you have installed VPN (For example, NordVPN or ProtonVPN), it may limit speed to 30-50% of the original. Try disabling the VPN and testing the speed again.

8. Hardware problems: when it's time to replace the hardware

If you have tried all the settings and the speed is still low, the problem may be hardwareHere are some signs that it's time to think about replacing or upgrading:

1. Outdated WiFi adapter:

• 🖥️ Adapters WiFi 4 (802.11n) physically incapable of exceeding 150–300 Mbps.
• 🔄 If you have USB dongle for 300 rubles, it most likely works on 802.11n and slows down due to a weak chip.

2. Adapter or antenna failure:

• 📡 If the speed drops when you move the laptop or change its angle, there may be a problem with the antennas.
• 🔌 On your PC, check if it fits tightly PCI-e adapter in the slot (sometimes the contacts become oxidized).

3. Router or adapter overheating:

• 🌡️ If the router is hot to the touch, it may throttle (reduce productivity).
• 💨 Dust in the vents is a common cause of overheating.

Solutions:

• 🆙 For a laptop: replace the adapter with a modern one (for example, Intel AX210 - supports WiFi 6E).
• 🖥️ For PC: Install PCI-e adapter (For example, TP-Link Archer TX3000E) or USB 3.0 dongle (For example, ASUS USB-AX56).
• 🔄 For a router: If it is more than 5 years old, consider upgrading to a model with WiFi 6 (e.g., TP-Link Archer AX6000 or ASUS RT-AX86U).

Important: If you have a laptop with a soldered-in WiFi module (for example, many models Lenovo IdeaPad or Acer Swift), replacing it will be difficult. In this case, an external USB adapter will help.

FAQ: Frequently asked questions about slow WiFi on Windows 10