Modern users are accustomed to instant page loading and 4K video streaming, but often encounter annoying delays. These issues may not be caused by your ISP, but by limitations of your equipment. Understanding how to measure your actual bandwidth is the first step to optimizing your home network.
Many people confuse the speed that a provider promises in a tariff plan with the speed that it is physically capable of providing. routerThe difference between these metrics can be dramatic, especially if the equipment is outdated or improperly configured. In this article, we'll discuss how to obtain accurate performance data for your access point.
It's important to distinguish between the download speed (WAN) and the internal data transfer speed (LAN/WLAN). The latter determines how quickly you can transfer a movie from your computer to your TV or back up your smartphone. Let's explore what determines this metric and how to measure it correctly.
Factors Affecting Throughput
The final figure is influenced by many variables, from the wireless standard to the wall materials in the apartment. Wi-Fi protocols (for example, 802.11n, ac, ax) set a theoretical speed ceiling, but in practice it is always lower than stated.
The physical location of the device plays a critical role. Metal structures, mirrors, and household appliances create interference. Furthermore, airwave congestion from neighboring routers in an apartment building can significantly reduce performance.
⚠️ Please note: Built-in antennas in budget models often have a narrow beam pattern, which creates "blind spots" even in small apartments.
The router's processor power is also a factor. When using active traffic encryption (WPA2/WPA3) or torrents, a weak device may simply not be able to process data packets, becoming a bottleneck.
- 📡 Wireless communication standard and channel width.
- 🏠 Number of walls and distance to the client.
- 📶 Frequency range occupancy by neighbors.
- ⚙️ Router CPU and RAM performance.
Don't forget about the connection type either. If your ISP offers 500 Mbps, but the cable is plugged into a FastEthernet port (100 Mbps), the router won't be able to physically go above that speed, regardless of the antenna power.
Wired Testing (Standard)
Before testing your WiFi, you need to understand your provider's speed. To do this, connect your computer directly to the router via a cable or LAN port. This will give you a baseline for comparison.
We use specialized services such as Speedtest.net or Fast.comIt's important to close all background programs, torrents, and updates to prevent them from distorting the results. It's best to conduct the measurement several times at different times of day.
If the speed via cable matches the plan's specifications, the problem lies with the wireless module. If the speed is still low via cable, you should contact your provider's technical support or replace the network cable.
For more in-depth diagnostics, you can use the utility iperf3It allows you to measure the throughput between two network nodes, eliminating the influence of the internet connection. It's the ideal tool for testing a local network.
iperf3 -c 192.168.1.1 -t 30This command will run a 30-second connection test with the server (in this example, the router). The results will show the actual bandwidth of the connection without the overhead of internet protocols.
WiFi speed testing
Now let's move on to the wireless connection. Get as close to the router as possible to avoid interference from walls. Connect your smartphone or laptop to a 5 GHz network, as the 2.4 GHz band is often congested and has speed limitations.
Run the same speed test as you did with a cable connection. Ideally, connection losses should not exceed 20-30% of the wired connection. If the difference is greater, the router settings may need optimization or the hardware is not coping.
☑️ WiFi Diagnostics
Move to a distant room and repeat the test. A sudden drop in speed indicates coverage issues. In this case, you may need to adjust the signal strength or install a repeater.
Pay attention to the parameter Link Speed (connection speed). In Windows, you can find it in the wireless adapter properties. This is the maximum speed negotiated between the device and the router, but the actual throughput will be approximately half that due to protocol overhead.
Using iPerf for Local Tests
Online testers depend on server load and internet bandwidth. For a thorough check of the router's capabilities, it's better to use a local test. You'll need two devices: one as a server and one as a client.
Install iPerf3 to a computer connected via cable (server) and to a laptop or phone (client). Launch the server part with the command iperf3 -sThen, on the client, enter the server's IP address.
⚠️ Important: When testing via WiFi, make sure that the client device supports the same standard (e.g. WiFi 5 or 6) as the router, otherwise the test will show the limitations of the client, not the router.
The test result in bits per second (bps) will show the actual radio bandwidth. Dividing by 8 will give the approximate speed in bytes you'll see when copying files.
This method is especially useful when choosing a new router. You can compare different models under similar conditions to see which one will provide the best performance. WiFi distribution in your apartment.
Analysis of standards and frequency ranges
Understanding the difference between 2.4 GHz and 5 GHz is critical. The former offers better penetration but lower speeds. The latter offers higher speeds but is less effective at penetrating walls.
Modern routers often combine both frequencies under a single name (Smart Connect). For testing, it's better to separate them by creating separate SSIDs to test each band separately.
Channel width is also important. For 2.4 GHz, 20 MHz is optimal to avoid interference with neighboring networks. For 5 GHz, 80 or 160 MHz is a safe bet, depending on the router and client devices' capabilities.
| Parameter | 2.4 GHz | 5 GHz | 6 GHz (WiFi 6E) |
|---|---|---|---|
| Max. speed | Up to 150-600 Mbps | Up to 1700+ Mbps | Up to 4000+ Mbps |
| Range | High | Average | Low |
| Noise immunity | Low | High | Very high |
| Penetrating through walls | Good | Bad | Very bad |
If your router only supports 2.4 GHz and your provider's plan is higher than 100 Mbps, you won't physically get full speed over the air. In this case, The only solution for high speeds is to switch to 5 GHz or replace the router..
Impact of encryption type and CPU load
Security is important, but it requires computing resources. Older encryption methods (WEP, TKIP) can limit speeds to 54 Mbps. Always use WPA2-AES or WPA3.
When parental controls, antivirus traffic protection, or QoS prioritization are enabled, the router's processor load increases. On budget models, this can lead to a drop in upload speed.
Check your router's CPU load during active downloads. If it's close to 100%, the device can't handle the data flow. In this case, disabling unnecessary features or upgrading the hardware may help.
⚠️ Note: Router interfaces and feature names may vary depending on the manufacturer (Keenetic, TP-Link, Asus, Mikrotik). Always consult the official documentation for your model.
Some firmware versions have hidden settings or limitations. Updating to the latest firmware version can sometimes significantly improve traffic management algorithms and connection stability.
Frequently Asked Questions (FAQ)
Why is WiFi speed 2 times slower than cable?
WiFi is a half-duplex interface; a device cannot simultaneously receive and transmit data on the same frequency. Furthermore, a significant portion of the channel is occupied by service data and packet acknowledgement. A loss of 40-50% of the cable speed is normal for wireless networks.
Can an old router deliver 100 Mbps over the air?
Yes, if it supports the 802.11n (WiFi 4) standard and is connected to the 5 GHz band or a clear 2.4 GHz network with a 40 MHz channel width. However, the speed stability will be low.
Does the number of connected devices affect the speed?
Absolutely. The bandwidth is shared among all active clients. If one device is downloading torrents, others will experience latency (ping) and speed drops. The QoS feature helps prioritize these connections.
How to increase WiFi speed without buying a new router?
Try changing the channel to a less crowded one, switching to the 5 GHz band, updating the firmware, and placing the router higher up, in the center of the room. Also, check if there are any speed limits in the settings.
Is it true that 5dBi antennas are better than standard ones?
Not always. High-gain antennas (dBi) change their beam pattern, flattening the signal. For a multi-story building, this may be worse than the omnidirectional signal of a standard antenna.