Users often encounter situations where a provider promises gigabit internet, but when connecting via a wireless network, the actual speed barely reaches 72 Mbps. This figure is no accident and is a direct indicator that your device is operating at the limits of an outdated standard or in a suboptimal mode. 72 Mbps (or something close to it, such as 54 or 65 Mbps) is the technical limit for a 20 MHz channel in the 2.4 GHz band using a single antenna.
It's important to understand that the connection speed between the router and the client device (laptop, phone) and the speed of the internet channel itself are two different things. If the link shows 72 Mbps, the actual payload you'll receive from your provider will only be around 40-45 Mbps due to protocol overhead. This is critically important to understand why the 100 Mbps tariff does not work “over the air”.
There are several fundamental reasons why speeds can be limited to this value. Most often, the problem lies in channel width settings, the physical placement of devices, or hardware limitations of the Wi-Fi module itself. In this article, we'll take a detailed look at the technical aspects of these standards. 802.11n And 802.11acso you can diagnose and fix your network bottleneck yourself.
Physical limitations of the 802.11n standard and channel width
The main reason for the appearance of the figure 72 Mbps lies in the specifications of the standard Wi-Fi 4 (802.11n)This standard, operating in the 2.4 GHz band, often uses a 20 MHz channel width by default to minimize interference. Using a single antenna (1x1 configuration) and 64-QAM modulation, the maximum physical data rate is 72.2 Mbps. If the channel were expanded to 40 MHz, the speed would theoretically double to 150 Mbps.
However, expanding the channel isn't always possible or practical. In apartment buildings, the 2.4 GHz band is heavily polluted by neighboring routers. Channel width Under these conditions, 40 MHz leads to collisions and a drop in actual speed, so many routers automatically roll back to 20 MHz, locking the link at 72 Mbps. This is a protective mechanism, not a malfunction.
It's also worth considering the number of antennas. Modern routers use MIMO technology, transmitting data through multiple antennas simultaneously. If your router has two antennas and your smartphone only has one (which is often the case with budget models), the connection will be established via the weakest link—that is, in 1x1 mode. As a result, even a powerful router won't be able to transmit data faster than the client's receiver can handle.
⚠️ Attention: Forcing the channel width to 40 MHz in dense urban areas can result in a slowdown and unstable connection. First, analyze the airwaves.
To change these settings, you need to log into the router interface. Typically, the path looks like this: Wireless -> Wireless Settings -> Channel WidthHere you can try switching the value from 20MHz on Auto or 40MHzBut remember that changing the settings requires rebooting the wireless module, and all connected devices will momentarily lose connection.
Diagnostics: 2.4 GHz vs. 5 GHz
The 2.4 GHz band has historically been overcrowded. It's used not only by Wi-Fi networks, but also by Bluetooth headsets, microwave ovens, and wireless mice. It's in this band that speeds are most often limited to 72 Mbps. Switching to the 5 GHz band (Wi-Fi 5 / 802.11ac or Wi-Fi 6 / 802.11ax) solves most speed problems, since there are more free channels and the channel width is up to 160 MHz.
If your device supports 5 GHz but connects to a 2.4 GHz network, it may be because the router settings have enabled the feature. Smart Connect (combining networks under a single name). The router itself decides which frequency to connect the client to, and sometimes makes mistakes, prioritizing the range of 2.4 GHz over the speed of 5 GHz. Separation of networks to different SSIDs (for example, Home_WiFi And Home_WiFi_5G) will allow you to force the gadget to connect to the fast range.
You can check your frequency using the Windows command line or Android settings. In Windows, open Terminal and enter the following command:
netsh wlan show interfacesIn output, find the line ChannelIf the channel number is between 1 and 13, you're in the 2.4 GHz band. If the number is higher (e.g., 36, 40, 149), you're in the 5 GHz band. There will also be a line there. Receive rate (reception speed), which will show the current link.
Impact of drivers and hardware
Often, the speed limitation lies not in the router, but in the network adapter of the computer or phone. Outdated drivers may not correctly negotiate the connection speed. For example, the adapter Realtek or Intel may operate in compatibility mode by default, ignoring the capabilities of a higher standard. Updating drivers from the manufacturer's official website is the first step in diagnostics.
The age of the device also matters. Laptops manufactured before 2010-2012 are often equipped with modules that only support the standard. 802.11g (maximum 54 Mbps) or early 802.11n With a single antenna. In this case, software-based speed increases above 72 Mbps are not possible—you'll need to replace the Wi-Fi module with an external USB adapter that supports 5 GHz.
You can check the adapter properties in Windows Device Manager. Go to Network adapters, right-click on your Wi-Fi module and select Properties -> AdvancedHere are some parameters to check:
- 📡 Wireless Mode: should stand
802.11nor802.11ac(Notb/g/n mixed). - 📡 Roaming Aggressiveness: better to install
Lowestso that the device does not constantly search for the best point, losing speed. - 📡 Throughput Booster: if there is, try turning it on (
Enabled).
What to do if there are no drivers in the Device Manager?
If the adapter name in Device Manager shows "Unknown Device" or is missing altogether, the Wi-Fi module may be physically disabled by the button on the laptop case or may be faulty. Check the Fn+F... key combination with the antenna icon.
Setting up a router: step-by-step instructions
To eliminate speed limitation, you need to configure your access point correctly. Below is a table of recommended settings for the 2.4 GHz band if you must use it. For the 5 GHz band, the settings will be broader.
| Parameter | Recommended value | Description of influence |
|---|---|---|
| Wireless Mode | 802.11 n/ac/ax mixed | Allows the use of modern high-speed protocols. |
| Channel Width | 40 MHz (2.4 GHz) / 80 MHz (5 GHz) | Increases the throughput of the "pipe". |
| Channel | 1, 6 or 11 (for 2.4 GHz) | Fixing on a free channel reduces interference. |
| Security | WPA2-PSK (AES) | The old WEP or TKIP standard cuts the speed to 54 Mbps. |
Pay special attention to the encryption type. If the security mode is selected in the security settings WPA/WPA2 Mixed or an algorithm is used TKIP, the speed is automatically limited by the 802.11g standard (54 Mbps). The only way to get speeds above 54 Mbps is to use AES (CCMP) encryption.This is a common mistake when manually configuring older routers.
After changing the settings, be sure to save them by clicking the button. Save/Apply and reboot the router. Client devices will also need to be reconnected to the network, as old connection parameters may remain cached in the OS.
☑️ Speed increase checklist
External factors and interference
Wi-Fi speeds dynamically change depending on environmental conditions. Even if the router is set to 150 Mbps, it may drop the link to 72 Mbps or lower if the signal is weak. This happens because of the adaptive modulation mechanism: the device reduces the speed to maintain a stable connection in the presence of interference.
The main enemies of the signal:
- 🧱 Walls and ceilings: concrete with reinforcement muffles the 5 GHz signal almost completely, 2.4 GHz passes better, but with losses.
- 📺 Household appliances: A working microwave oven creates powerful interference in the 2.4 GHz range.
- 📶 Neighbors' routers: If there are 5-6 neighboring points operating on your channel, the speed will drop for everyone due to data transmission queues.
To combat this, you can try relocating the router, elevating it higher or moving it away from metal objects. Installing a higher-gain external antenna, if the router supports replacement, also helps.
⚠️ Attention: Interfaces and setting names may vary depending on the router model (Keenetic, TP-Link, Asus, MikroTik) and firmware version. If you're unsure about a specific option, consult the manufacturer's official documentation.
FAQ: Frequently Asked Questions
Why is the Wi-Fi speed only 72 Mbps with a 100 Mbps plan?
The 72 Mbps speed is the connection speed (link) between the device and the router. Due to TCP/IP protocol overhead, the actual usable speed will be around 45-50 Mbps. To achieve 100 Mbps, the link speed must be at least 150 Mbps (for 2.4 GHz) or 433 Mbps (for 5 GHz).
Is it possible to increase the speed to 72 Mbps without replacing the router?
Yes, if your router is dual-band. Switch to the 5 GHz network. If your router is single-band, try setting the channel width to 40 MHz in the settings and make sure AES encryption is enabled, not TKIP.
Does the number of connected devices affect the 72 Mbps speed?
Yes. Wi-Fi is a half-duplex medium. The more devices actively downloading data, the less time (time slots) each device gets, which reduces individual speed.
Why is the speed on the phone higher than on the laptop?
Most likely, your phone is connected to 5 GHz and your laptop to 2.4 GHz, or your laptop has an outdated Wi-Fi module with a single antenna. Check the connection properties on both devices.