Many users mistakenly believe that if a provider provides a 100 Mbps channel, every connected device will receive exactly that speed, regardless of the number of devices on the network. This is a fundamental misconception that leads to a lack of understanding of the causes of lag in games or video buffering on a 4K TV. In reality, channel capacity — is a limited resource that is distributed dynamically and not always equally.
Imagine your internet connection as a wide water pipe, and the devices in your home as faucets connected to this system. If you open one faucet, the flow rate will be maximum. But if you turn the valve on the second, third, or tenth faucet, the pressure (flow rate) will drop for everyone, assuming the total volume of water supplied (the provider's rate) remains the same. However, in the world of wireless technology, the process is even more complex due to the nature of radio wave transmission.
In this article, we'll take a detailed look at the physical and software principles of traffic distribution. You'll learn why an old router can't deliver the advertised speed even on a single device, and how modern standards Wi-Fi 6 These are game-changers. Understanding these processes will help you properly configure your home network and avoid equipment conflicts.
The physical nature of traffic distribution in a wireless network
Unlike wired networks, where each port can operate at its maximum speed independently of the others (within the bandwidth of the switch), Wi-Fi works on the principle half-duplex transmissionThis means that the router and client device (smartphone, laptop) cannot transmit data in both directions simultaneously. They must negotiate who is speaking and who is listening at any given moment.
The main limiting factor here is not so much the internet speed from the provider, but airtimeA router creates a coverage zone around itself, where all devices share the same frequency. If you have 10 devices connected, the router switches between them at breakneck speed, creating the illusion of parallel operation. In reality, it serves them one at a time, allocating tiny time slots to each.
The situation is exacerbated if there are "slow" devices on the network. Wi-Fi standards are backward compatible. If a modern router TP-Link Archer If an older smartphone that only supports the 802.11g standard connects, the router will be forced to spend more time transmitting data to this "slowpoke," delaying service to faster clients. This phenomenon is often called the "leader effect," where the entire network's speed drops to the level of the slowest device.
⚠️ Attention: The presence of even one legacy device (old standard) in the line of sight can reduce the overall performance of the entire Wi-Fi cell by forcing the router to use more reliable, but slower, signal encoding methods.
Additionally, signal attenuation and interference must be factored in (and mustn't be ignored). The farther a device is from the router, the lower the connection speed (link speed), and the more time the router spends transmitting the same amount of data to that client. As a result, "remote" devices consume a disproportionate amount of airtime, depriving those located nearby.
Division Mathematics: Equal or According to Needs?
There's a common myth that a router splits the speed evenly among all active users. If you have a 100 Mbps plan and two phones, each will get 50 Mbps. In reality, network equipment algorithms Netgear, Asus or Keenetic They work differently. Distribution occurs based on the "who requested what" principle, but takes into account priorities and the current channel load.
If one device simply keeps a messenger open (minimal consumption, background packets), while the other downloads a heavy game via torrent, the router will give almost the entire bandwidth to the second device. For the first device, 0.1 Mbps is enough to maintain the connection. Problems arise when both devices require high bandwidth simultaneously—for example, a video conference on a laptop and 4K streaming on a TV.
In this case, the queuing mechanism comes into play. The router cannot physically transmit more data than its WAN port and radio module can handle. This creates buffering (a packet queue). If the queue overflows, new packets are simply discarded, leading to lost connections and the need to resend the data, further reducing usable bandwidth.
For clarity, let's look at how channel resources are distributed depending on the type of activity:
- 📉 Background mode: Messengers, email, and notifications take up less than 1% of the channel, but require a stable ping.
- 🎬 Video streaming: YouTube or Netflix consume a stable stream (for example, 15-25 Mbps for 4K), which is maintained constantly.
- 🎮 Online games: They consume little traffic, but latency and the absence of jitter (ping spread) are critical.
- 💾 Uploading files: Torrents or Steam updates try to take up 100% of the available speed, creating the greatest pressure on the network.
Thus, the "fairness" of speed sharing depends on the settings of the packet scheduler algorithms within the router firmware. Without special settings (QoS), bandwidth-hungry applications will always dominate less demanding ones.
The Impact of Wi-Fi Standards and Frequency Ranges
The speed each device receives directly depends on the frequency band and standard it's connected to. Modern routers are often dual-band: 2.4 GHz and 5 GHz. These are two independent "pipelines" that can operate in parallel without interfering with each other.
The 2.4 GHz band offers greater range, but it's narrow and heavily polluted by neighboring routers, microwaves, and Bluetooth headsets. Maximum real-world speeds rarely exceed 40-60 Mbps, even under ideal conditions. If all your devices are saturating this band, they'll be sharing the limited bandwidth, and speeds will drop dramatically.
The 5 GHz band provides wider channels and less interference. Standards Wi-Fi 5 (802.11ac) And Wi-Fi 6 (802.11ax) Allows for gigabit speeds over the air. However, 5 GHz has a drawback: poorer penetration through walls. A device connected through two concrete walls at 5 GHz may receive a signal weaker than 2.4 GHz and automatically switch to a lower connection speed.
The latest standard Wi-Fi 6 is implementing OFDMA (Orthogonal Frequency-Division Multiple Access) technology. Simply put, it allows a router to transmit data to multiple devices simultaneously within a single time slot, using different frequency subcarriers. This radically changes the "first come, first served" principle, allowing for more efficient servicing of multiple devices.
It's also important to consider channel width. In the 5 GHz band, you can set the channel width to 20, 40, 80, or even 160 MHz. The wider the channel, the higher the speed for a single device, but the fewer available channels are available. In an apartment building, setting the channel width to 160 MHz can result in you "covering" all your neighbors, and interference will reduce speeds for everyone, including you.
QoS technology: traffic prioritization
To control how the speed is divided, routers have a function QoS (Quality of Service)It allows the network administrator to set priority rules. Instead of letting a torrent hog all the bandwidth, you can tell the router, "First, give packets to the video call, then to the browser, and only then to downloads."
Setting up QoS is especially important for families who work, study, and play simultaneously. Without this technology, a Zoom conference might stutter while someone downloads a PlayStation update. QoS artificially limits "heavy" protocols or allocates guaranteed bandwidth to critical devices.
There are two main approaches to implementation:
- 🚀 Port/protocol priority: You specify that traffic on port 443 (HTTPS) or for Skype has high priority.
- 🏠 Priority by devices (IP/MAC): You assign the status "VIP" to your work laptop and "Regular User" to your smart TV.
☑️ Setting up traffic priorities
It's worth noting that not all QoS implementations are equally effective. In low-end router models, enabling this feature can overload the processor so much that overall internet speeds will drop for everyone. Therefore, for complex use cases, equipment with a powerful CPU, such as those based on Broadcom or Qualcomm.
Hardware limitations: router processor and memory
Many people forget that a router is a fully-fledged computer with its own processor (CPU), random access memory (RAM), and flash memory. Internet speed is limited not only by the provider's plan, but also by NAT performance (Network Address Translation). The router must process each data packet: check headers, determine the route, apply firewall rules and QoS.
If you have a 500 Mbps plan and your router has a weak single-core 300 MHz processor, it won't be able to handle the incoming traffic. As a result, the speed will be throttled at 80-100 Mbps, regardless of the number of connected devices. With a large number of clients (20-30), the load on the NAT table increases, and a weak router will begin to drop packets or freeze.
Encryption (if you're running a VPN directly on your router) and deep packet inspection (traffic antivirus protection) are particularly resource-intensive. Enabling these features on a budget device can reduce speeds by 3-5 times. High-speed plans require routers with this functionality. Hardware NAT (hardware acceleration), where routing is handled by a separate chip, offloading the main processor.
| Router class | Processor type | Real NAT speed (without acceleration) | Recommended number of devices |
|---|---|---|---|
| Budget (Entry-level) | Single-core, 300-600 MHz | up to 100 Mbit/s | 3-5 devices |
| Mid-range | Dual-core, 800 MHz - 1 GHz | 200-400 Mbps | 10-15 devices |
| High-end | Multi-core, 1.4 GHz+ | 800 Mbps - 1 Gbps+ | 20+ devices |
| Gaming / Pro | Powerful CPU + Hardware NAT | 2.5 Gbps+ | 50+ devices |
RAM capacity is also important. When actively using torrents or with a large number of connections, the connection table grows. If the RAM is full, new connections simply won't be established, and you'll feel like the internet is down, even though the connection is free.
The problem of "neighborhood" and external factors
Even if you have a perfect router and a powerful data plan, your speed may be unevenly distributed or drop due to external factors. In apartment buildings, the airwaves are clogged with signals from dozens of neighboring access points. They operate on the same frequencies, creating a jumble of radio waves.
The router is forced to wait for a pause in the air to send a packet. If the airwaves are constantly busy (high noise levels), the usable throughput drops. It's like a party in a noisy bar: to be heard, you have to speak louder and repeat your sentences, which takes longer. In Wi-Fi, this manifests itself in packet retransmissions.
⚠️ Attention: Using automatic channel settings ("Auto") isn't always effective. The router may select a "free" channel, which will be occupied by a neighbor after five minutes. It's recommended to manually analyze the airwaves and identify the least congested frequencies.
Physical obstacles also affect speed. Aquariums, mirrors, metal wall fittings, and household appliances (especially microwaves) create "radio shadow" zones. A device in such a zone will operate at a minimum connection speed, consuming a disproportionate amount of airtime, thereby slowing down the entire network.
How does a microwave affect Wi-Fi?
Microwave ovens operate at 2.4 GHz. When turned on, they create powerful interference, completely clogging the channel. If your router operates in this range, your speed may drop to zero while heating food. Solution: Switch important devices to 5 GHz.
Practical recommendations for optimization
To maximize speed for each device, it's important to take a comprehensive approach to network configuration. Don't rely solely on the factory settings. The first step is updating your router firmware to the latest version. Engineers are constantly improving traffic distribution algorithms and radio module stability.
The second step is proper zoning. Separate devices by frequency band. Smart home devices (light bulbs, outlets), which transmit little data but require stability, are best placed on the 2.4 GHz band. Laptops, consoles, and TVs should be strictly on the 5 GHz band. If your router supports Smart Connect (network aggregation), try disabling it and creating two separate networks with different names (SSIDs) so you can manually assign devices.
It's also worth checking to see if you have old, slow security standards or operating modes enabled. Make sure the wireless network settings are set to 802.11 ac/ax mixed or similar, excluding support for ancient b/g standards if there are no devices in the house that require them.
If none of these methods work and the number of devices is growing, consider building a mesh system. Multiple interconnected access points will help distribute the load. Clients will connect to the closest node rather than a single central router, reducing competition for airtime.
Why is the speed on my phone lower than on my computer connected to the same router?
Smartphones often have less powerful Wi-Fi modules (one antenna versus 2-4 on PCs), support narrower channels, and support older standards. Furthermore, the phone's OS may aggressively conserve power by reducing receiver power.
Does the number of connected devices affect ping in games?
Yes, directly. When one device starts downloading a file, it creates a packet queue. Game packets are forced to wait in this queue, which increases latency (ping) and causes lag. Only QoS can save the day.
Can a router cut speed itself?
Yes, if parental controls, antivirus software, speed limits for specific devices are enabled, or if the router's processor cannot handle the data flow (see the section on hardware limitations).
What is MU-MIMO and does it help?
MU-MIMO (Multi-User, Multiple Input, Multiple Output) allows a router to communicate with multiple devices simultaneously, rather than one at a time. This is a real help in networks with multiple clients, but only if the devices themselves (phones, laptops) also support this technology.
Is it worth buying a router with Wi-Fi 6 support if the plan only offers 100 Mbps?
Yes, it is. Wi-Fi 6 works more efficiently with multiple devices and reduces latency even at low internet speeds. It manages airtime better, making the network more stable in an apartment building.