Why WiFi Speed Is Different on Different Devices

You run a speed test on your laptop and get 350 Mbps. Then you test your phone from the same spot and get 80 Mbps. Same router, same network, same room — wildly different results. This isn’t a glitch. It’s completely normal, and there are specific, well-understood reasons why every device on your network gets a different speed.

Understanding those reasons helps you set realistic expectations, troubleshoot real problems, and make smarter decisions about which devices you upgrade first.

1. The Device’s WiFi Standard (Generation)

The single biggest factor is which WiFi generation your device’s wireless chip supports. WiFi standards have evolved dramatically over the past decade:

• WiFi 4 (802.11n): Max theoretical speed ~150–600 Mbps. Found in devices made before 2015.
• WiFi 5 (802.11ac): Max theoretical ~3.5 Gbps. Common in devices from 2015–2020.
• WiFi 6 (802.11ax): Max theoretical ~9.6 Gbps. Standard in devices from 2020 onward.
• WiFi 6E: Same as WiFi 6 but adds the 6 GHz band. Available in flagship phones and laptops from 2021–2023 onward.
• WiFi 7 (802.11be): Max theoretical ~46 Gbps. Found in high-end devices released in 2024 and later.

A device with a WiFi 4 chip is fundamentally limited regardless of how fast your router or internet plan is. Your router negotiates the connection at the best speed both sides can support — the older device always caps the ceiling.

2. Number of Antennas and Spatial Streams

Modern WiFi uses MIMO (Multiple Input, Multiple Output) technology — multiple antennas sending and receiving data simultaneously on separate “spatial streams.” More streams means more throughput.

A WiFi 5 router might support 4×4 MIMO (four antennas sending four streams). But your phone likely only has 1×1 or 2×2 MIMO because phone manufacturers are constrained by physical size, battery life, and cost. Antennas need to be spaced at least one-third of a wavelength apart, which is physically difficult in a thin smartphone.

Result: A 4×4 laptop gets four times the throughput of a 1×1 phone on the same network. This is one of the most common explanations for dramatic speed differences between phones and laptops.

3. Which WiFi Band the Device Uses

Routers broadcast on multiple frequency bands simultaneously. The band a device connects to has a huge impact on speed:

• 2.4 GHz: Longer range, more interference from neighbors and appliances, max real-world speed typically 50–150 Mbps.
• 5 GHz: Shorter range, less interference, real-world speeds of 200–500+ Mbps.
• 6 GHz: Shortest range, almost zero interference (new band), real-world speeds of 1 Gbps+ on capable hardware.

Older or budget devices that only support 2.4 GHz will always look slow compared to modern devices on 5 GHz or 6 GHz. Even on the same router, a 2.4 GHz device and a 5 GHz device are getting fundamentally different experiences. Check out our guide on 2.4 GHz vs 5 GHz vs 6 GHz for a deeper comparison.

4. Distance From the Router and Physical Obstacles

WiFi signal strength falls off with distance and is blocked or absorbed by walls, floors, furniture, and appliances. But different devices handle this differently:

• Devices with more antennas can maintain higher connection speeds at greater distances.
• A device that supports 5 GHz will see faster speed drops with distance than one on 2.4 GHz, because higher frequencies don’t penetrate walls as well.
• A laptop sitting next to the router on 5 GHz can easily hit 400 Mbps, while a phone in the next room on 2.4 GHz might see 40 Mbps.

If a device consistently shows slower speeds in one specific location, try moving it closer to the router or access point. If speeds improve significantly, you have a coverage problem. A mesh system can help — see our guide on mesh WiFi vs extenders.

5. Device Processor and Network Interface Card Quality

Not all WiFi chips are created equal, even within the same generation. Premium chipsets from Intel (for laptops) or Qualcomm (for phones) tend to perform better than budget alternatives because they:

• Handle more simultaneous spatial streams
• Implement smarter beamforming (focusing the signal toward the device)
• Recover from interference more gracefully
• Support features like 160 MHz channel width (which dramatically increases throughput)

A budget Android phone with a MediaTek chip and a 1×1 WiFi antenna will always lose a speed test against a MacBook Pro or Dell XPS with a premium Intel WiFi 6E card — even in identical conditions.

6. Background Processes and Device Load

A speed test measures how fast your device can download and upload data. If your device is simultaneously running a cloud backup, syncing files, or downloading updates in the background, those processes consume bandwidth and CPU cycles that would otherwise go to your test — making the result look lower than your actual connection allows.

Before running a speed test, close all other apps and pause any sync services (iCloud, Dropbox, Google Drive, Windows Update) to get an accurate reading.

7. Driver and Firmware Quality

On Windows PCs especially, the wireless adapter driver significantly affects performance. Generic drivers installed by Windows Update are often not optimized for your specific hardware. Outdated or poorly written drivers can reduce throughput by 30–50% compared to the manufacturer’s latest version.

If one device is consistently slower than expected, check for driver updates from the manufacturer (Intel, Realtek, Qualcomm) or your laptop maker’s support page. Keeping router firmware updated also helps — see our guide on how to update router firmware.

How to Diagnose the Real Problem

When speeds differ significantly between devices, use this process to find the cause:

1. Test each device from the same spot, right next to the router. This eliminates distance and obstacle variables.
2. Note which band each device is on. Log into your router admin panel to see which band each device is connected to.
3. Check the device’s WiFi specs. Look up your device model and confirm what WiFi generation and how many streams it supports.
4. Close all background apps on the slow device and retest.
5. Update drivers on Windows devices and firmware on routers.

Summary: Why Speeds Differ

In most cases, speed differences between devices come down to hardware capability — older WiFi generations, fewer antennas, and budget chipsets will always underperform compared to newer, more capable hardware. Distance and band selection are the next biggest factors. Software issues like outdated drivers and background processes are fixable, but hardware limitations require an upgrade to overcome.

If you want all your devices to see faster speeds, upgrading to a WiFi 6 or WiFi 6E router helps your capable devices reach their potential, but slower older devices will still be limited by their own hardware. Sometimes the bottleneck is the device itself, not the network.