It feels backward.
After all, Ethernet has long been considered the gold standard for internet connectivity. Unlike WiFi, which has to send data through walls, furniture, and a sea of competing wireless signals, Ethernet uses a dedicated physical cable to carry data directly between your device and your router.
So why would a wired connection perform worse?
In most cases, Ethernet itself isn't the problem. A damaged cable, outdated network driver, router limitation, or incorrect network settings can create a bottleneck that slows your connection. Sometimes, a computer is unknowingly connected at just 100 Mbps instead of 1 Gbps, leaving much of its available bandwidth unused.
The good news is that these issues are usually straightforward to diagnose and fix.
In this guide, you'll learn why Ethernet is normally faster than WiFi, what can cause it to become slower instead, and the most effective ways to restore your wired connection to full speed.
Quick Answer
If your Ethernet connection is slower than WiFi, the most common causes include:
- A damaged or outdated Ethernet cable
- A network adapter limited to 100 Mbps instead of Gigabit speeds
- Outdated or corrupted network drivers
- Router or switch port problems
- Incorrect speed or duplex settings
- Background downloads consuming bandwidth
- VPN or security software slowing network traffic
- ISP or modem limitations
Working through each of these possibilities can help you identify exactly where the slowdown is occurring.
Is Ethernet Supposed to Be Faster Than WiFi?
Under normal conditions, yes. Ethernet is almost always faster, more stable, and more reliable than WiFi.
That doesn't mean WiFi is slow. Modern wireless standards such as WiFi 6 and WiFi 6E can deliver impressive speeds, especially when you're close to the router. However, wireless connections are affected by distance, interference, and the number of devices sharing the network.
Ethernet avoids many of those limitations by using a dedicated cable instead of radio waves.
Why Ethernet Usually Outperforms WiFi
Think of WiFi as having a conversation across a crowded room. Every voice, wall, and electronic device creates noise that can make communication less efficient.
Ethernet is more like having a private telephone line. The connection is direct, stable, and far less likely to be interrupted.
Because of this, Ethernet typically offers:
- Lower latency for gaming and video calls
- More consistent download and upload speeds
- Better reliability during large file transfers
- Less interference from nearby devices
- Higher sustained performance under heavy network usage
These advantages are why gaming PCs, desktop workstations, servers, and smart TVs often perform best when connected with an Ethernet cable.
Ethernet vs. WiFi at a Glance
| Ethernet | WiFi |
|---|---|
| Lower latency | Higher latency |
| Stable speeds | Speeds can fluctuate |
| Immune to wireless interference | Affected by walls, distance, and nearby electronics |
| Ideal for gaming and large downloads | Best for convenience and mobility |
| Dedicated wired connection | Shared wireless spectrum |
Even though Ethernet has these advantages, the entire connection is only as strong as its weakest component.
A premium Ethernet cable connected to an outdated router, damaged network port, or misconfigured network adapter can still perform worse than a modern WiFi connection.
That's why understanding the entire path your internet traffic takes is the key to solving the problem.
Why Is My Ethernet Slower Than WiFi?
When people think about internet speed, they often assume the Ethernet cable alone determines how fast their connection will be. In reality, your wired connection is part of a much larger chain.
Every piece of hardware between your computer and your internet service provider has the potential to slow things down.
That chain typically looks like this:
Computer → Network Adapter → Ethernet Cable → Router or Switch → Modem → Internet Service Provider
If just one of those components has a problem, it can limit the speed of your entire connection. For example, a Gigabit internet plan won't feel very fast if your computer negotiates a 100 Mbps connection, or if an aging Ethernet cable can't reliably carry higher speeds.
Rather than guessing, it's more effective to identify each possible bottleneck one by one. The following fixes are arranged from the most common and easiest to check through to more advanced troubleshooting steps.
1. Check Your Ethernet Cable
One of the most common reasons an Ethernet connection is slower than WiFi is surprisingly simple: the cable itself.
While Ethernet cables look nearly identical from the outside, they aren't all built to support the same speeds. An old, damaged, or poor-quality cable can force your computer and router to communicate at a much lower speed than they're capable of.
Before changing Windows settings or replacing networking hardware, it's worth inspecting the cable first.
Not All Ethernet Cables Support Gigabit Speeds
Ethernet cables are divided into categories, often printed along the cable jacket. The category determines the maximum speed and bandwidth the cable can reliably support.
Here's a quick comparison:
| Cable Category | Typical Maximum Speed | Recommended Today |
|---|---|---|
| Cat5 | 100 Mbps | No |
| Cat5e | 1 Gbps | Yes |
| Cat6 | 1 Gbps to 10 Gbps (short distances) | Yes |
| Cat6a | Up to 10 Gbps | Best for future-proofing |
If you're still using an old Cat5 cable, your Ethernet connection may never exceed 100 Mbps, even if you pay for a much faster internet plan.
Inspect the Cable for Physical Damage
Ethernet cables are more durable than they appear, but they aren't indestructible.
Look for:
- Sharp bends or kinks
- Frayed or exposed wiring
- Broken locking clips
- Loose connectors
- Signs that the cable has been pinched under furniture
Even minor damage can introduce transmission errors that reduce performance or cause the connection to repeatedly renegotiate at lower speeds.
Try Another Ethernet Cable
The quickest way to rule out a faulty cable is to replace it with another known-good cable.
If your speeds immediately improve after switching cables, you've found the culprit.
When buying a replacement, choose at least a Cat5e cable. If you're purchasing a new cable today, Cat6 is often the better long-term investment because it supports higher network speeds and offers better resistance to interference.
2. Check Whether Your Network Adapter Is Limited to 100 Mbps
A surprisingly common issue is that your computer isn't actually connected at Gigabit speed.
Many users assume that plugging in an Ethernet cable automatically gives them the fastest possible connection. In reality, your computer and router negotiate a connection speed when the cable is connected. If something goes wrong during this process, they may fall back to 100 Mbps instead of 1 Gbps.
That limitation alone can make your Ethernet connection appear slower than WiFi, especially if your wireless network supports higher speeds.
How to Check Your Ethernet Link Speed in Windows
You can verify your current Ethernet connection speed in just a few steps:
- Open Settings.
- Go to Network & Internet.
- Select Ethernet.
- Click your active network connection.
- Look for the Link speed (Receive/Transmit) value.
If it shows 100 Mbps but your internet plan and router support Gigabit Ethernet, something is preventing the connection from operating at full speed.
What Causes a 100 Mbps Connection?
Several issues can force an Ethernet connection to negotiate at 100 Mbps instead of 1 Gbps, including:
- An older Cat5 Ethernet cable
- A damaged Ethernet cable
- A faulty router or switch port
- A network adapter that only supports Fast Ethernet
- Loose cable connections
Because several different components can cause this limitation, it's best not to assume the cable is the only problem. Continue working through the remaining fixes until you've identified the true bottleneck.
3. Check Your Router or Switch Ports
Your computer is only one part of the network. The router, modem, or network switch also plays a critical role in determining your connection speed.
Even if your computer supports Gigabit Ethernet, connecting it to an older router with 100 Mbps LAN ports will cap your speeds before data ever reaches your device.
Test a Different Ethernet Port
Network ports can occasionally develop faults or become unreliable over time.
If your router has multiple LAN ports:
- Disconnect the Ethernet cable.
- Plug it into a different LAN port.
- Restart the connection.
- Run another speed test.
If speeds improve, the original port may be damaged or malfunctioning.
Check Your Router's Specifications
Not every router includes Gigabit Ethernet ports.
Older or budget models may only offer 10/100 Mbps ports, which limit the maximum speed available to every connected device.
If your internet plan is faster than 100 Mbps, verify that your router supports Gigabit Ethernet (10/100/1000 Mbps). Otherwise, upgrading the router may be necessary to take full advantage of your broadband connection.
4. Update or Reinstall Your Network Adapter Driver
Your network adapter relies on software called a driver to communicate with Windows. If that driver is outdated, corrupted, or incompatible after a Windows update, your Ethernet connection may become slower or less stable.
Although Windows installs drivers automatically, they're not always the latest version available from the hardware manufacturer.
Update Your Network Driver
To check for a newer driver:
- Right-click the Start button and select Device Manager.
- Expand Network adapters.
- Right-click your Ethernet adapter.
- Select Update driver.
- Choose Search automatically for drivers.
If Windows doesn't find a newer version, visit your computer or motherboard manufacturer's website and download the latest Ethernet driver manually. Manufacturers often release updates that improve performance, compatibility, and stability.
Reinstall the Driver
If updating doesn't help, reinstalling the driver can resolve corrupted driver files.
To do this:
- Open Device Manager.
- Right-click your Ethernet adapter.
- Select Uninstall device.
- Restart your computer.
Windows will usually reinstall the driver automatically after rebooting.
5. Check Your Speed and Duplex Settings
Most modern network adapters automatically negotiate the fastest possible connection with your router. This process is known as auto-negotiation.
Occasionally, that negotiation fails, causing the connection to operate at a slower speed or use the wrong duplex mode.
What Is Duplex Mode?
Duplex mode determines how devices communicate over an Ethernet connection.
- Half Duplex allows data to travel in one direction at a time.
- Full Duplex allows data to be sent and received simultaneously.
Today's Gigabit Ethernet networks are designed to operate in Full Duplex, which provides significantly better performance.
Verify the Adapter Settings
To check these settings:
- Open Device Manager.
- Expand Network adapters.
- Right-click your Ethernet adapter and select Properties.
- Open the Advanced tab.
- Locate Speed & Duplex or a similarly named option.
In most cases, Auto Negotiation is the recommended setting. If troubleshooting indicates a negotiation issue, you can temporarily test 1.0 Gbps Full Duplex, provided both your network adapter and router support Gigabit Ethernet.
If changing this setting doesn't improve performance, switch it back to Auto Negotiation.
6. Close Programs That Are Using Your Internet Connection
Sometimes the Ethernet connection isn't actually slow. Instead, another application is consuming most of your available bandwidth behind the scenes.
Large downloads, cloud synchronization, automatic updates, and streaming software can all reduce the speed available for everything else.
Check Network Usage in Task Manager
Windows makes it easy to see which applications are actively using your internet connection.
- Press Ctrl + Shift + Esc to open Task Manager.
- Select the Processes tab.
- Click the Network column to sort applications by bandwidth usage.
If you notice an application continuously using large amounts of data, pause or close it before running another speed test.
Common Bandwidth-Hungry Applications
Applications that frequently consume network bandwidth include:
- Windows Update
- Microsoft OneDrive
- Google Drive
- Dropbox
- Steam
- Epic Games Launcher
- Xbox app downloads
- Adobe Creative Cloud
- Torrent clients
- Video streaming services
Pausing these activities can provide a much more accurate picture of your actual Ethernet performance.
7. Temporarily Disable Your VPN or Security Software
Virtual Private Networks (VPNs) and certain security programs inspect or encrypt your internet traffic before it leaves your computer. While this improves privacy and security, it can also reduce connection speeds.
This slowdown is often more noticeable on high-speed internet plans, where encryption becomes the limiting factor rather than the network itself.
Test Your Connection Without the VPN
If you're using a VPN:
- Disconnect from the VPN server.
- Run another internet speed test.
- Compare the results.
If speeds increase significantly, the VPN server or encryption overhead is likely responsible.
Check Security Software
Some antivirus suites include features such as:
- Web traffic scanning
- Network monitoring
- Firewall inspection
- Secure browsing filters
These features can occasionally affect network performance.
If you suspect your security software is contributing to the slowdown, temporarily disable its network protection features, perform another speed test, then re-enable them immediately afterward. This helps determine whether the software is part of the problem without leaving your computer unprotected for longer than necessary.
Restart Your Modem and Router
Routers and modems are essentially small computers that run continuously, often for weeks or even months without being restarted. Over time, temporary software glitches, memory issues, or network congestion can affect their performance and reduce internet speeds.
Restarting your networking equipment is one of the simplest troubleshooting steps, yet it often resolves temporary connection problems.
How to Properly Restart Your Network Equipment
For the best results:
- Turn off your modem and router.
- Unplug both devices from the power outlet.
- Wait at least 30 to 60 seconds.
- Plug the modem back in and wait until all status lights indicate it's fully connected.
- Turn on the router and allow it to finish booting.
- Reconnect your computer and run another speed test.
This process refreshes your network connection and allows your modem to establish a fresh connection with your internet service provider.
Why Restarting Can Improve Ethernet Speeds
A reboot can resolve issues such as:
- Temporary software glitches
- Network memory leaks
- Router overload from many connected devices
- Failed network negotiations
- Minor firmware hiccups
While restarting won't fix faulty hardware or damaged cables, it's a quick step that can eliminate several temporary causes of slow Ethernet performance.
Check Whether Your Internet Plan Is the Bottleneck
Sometimes the Ethernet connection isn't the problem at all.
If your internet plan only provides 100 Mbps, switching from WiFi to Ethernet won't magically increase your download speed beyond that limit. Ethernet can provide a more stable connection, but it can't exceed the bandwidth your internet service provider delivers.
Compare Your Speed Test With Your Internet Plan
Run a speed test using a reputable service and compare the results with the speed included in your broadband subscription.
For example:
- If you pay for 100 Mbps and consistently receive around 95 Mbps, your connection is performing normally.
- If you pay for 500 Mbps but only receive 90 to 100 Mbps over Ethernet, there's likely a bottleneck somewhere in your network.
Knowing your subscribed speed helps you determine whether the issue lies with your home network or your internet provider.
Test Another Device
If possible, connect another computer to the same Ethernet cable and router port.
If both devices experience similar slow speeds, the issue is more likely related to the router, modem, cable, or ISP.
If only one computer is affected, the problem is probably specific to that computer's network settings, drivers, or hardware.
Test Your Ethernet Speed Correctly
Running a single speed test isn't always enough to diagnose network problems.
Internet speeds naturally fluctuate depending on network congestion, server load, and the testing location. To get a more accurate picture, perform multiple tests under consistent conditions.
Best Practices for Speed Testing
For reliable results:
- Disconnect unnecessary devices from your network.
- Pause downloads, cloud backups, and software updates.
- Close streaming services and online games.
- Run several tests at different times of day.
- Use the same test server whenever possible.
Testing during peak evening hours may produce different results than testing early in the morning.
Don't Rely Solely on Speed Tests
Speed test websites are useful, but they don't always reflect real-world performance.
Try downloading a large file from a trusted source or transferring files across your local network. If downloads are consistently fast even when speed test results vary, the issue may be with the testing server rather than your Ethernet connection.
Advanced Troubleshooting
If you've worked through the previous fixes and your Ethernet connection is still slower than WiFi, a few advanced settings may be worth checking.
These options aren't the cause of most slow connections, but they can occasionally improve performance on certain hardware.
Disable Energy Efficient Ethernet
Some network adapters support Energy Efficient Ethernet (EEE), a feature designed to reduce power consumption when the network is idle.
Although useful in theory, certain hardware combinations don't handle this feature well, leading to reduced speeds or intermittent performance issues.
You can usually disable this option from your network adapter's advanced properties in Device Manager.
Review Quality of Service (QoS) Settings
Some routers prioritize certain types of network traffic using Quality of Service (QoS).
While this can improve gaming or video streaming, an incorrect configuration may unintentionally limit bandwidth for your computer.
Log in to your router's administration page and review any QoS rules that could be affecting your Ethernet-connected device.
Update Your Router's Firmware
Router manufacturers regularly release firmware updates that improve security, compatibility, and performance.
An outdated router firmware version may contain bugs that affect wired connections or network stability.
Visit your router manufacturer's support page, compare your installed firmware version with the latest available release, and update it if necessary. Follow the manufacturer's instructions carefully to avoid interrupting the update process.
When the Problem Is Hardware Failure
If none of the previous fixes improve your Ethernet speed, faulty hardware becomes a more likely possibility.
Hardware components naturally wear out over time, especially if they've experienced electrical surges, physical damage, or years of continuous use.
Common hardware failures include:
- A failing Ethernet network adapter
- A damaged motherboard Ethernet port
- A defective router or network switch
- A faulty modem
- A worn or internally damaged Ethernet cable
One of the easiest ways to isolate a hardware issue is to swap individual components one at a time. Try a different Ethernet cable, connect to another router port, or test your computer on a different network. If the problem follows the computer, the network adapter may be at fault. If another device experiences the same slowdown, the issue is more likely elsewhere in your network.
Once you've ruled out software settings and temporary glitches, replacing the failing hardware is often the fastest and most reliable long-term solution.
Frequently Asked Questions
Why is my Ethernet slower than WiFi on Windows 11?
Windows 11 itself isn't usually the cause of slow Ethernet speeds. In most cases, the issue is related to outdated network drivers, incorrect adapter settings, damaged Ethernet cables, or router limitations. Checking your link speed, updating your network adapter driver, and testing with another Ethernet cable can often identify the problem.
Can a bad Ethernet cable reduce internet speed?
Yes. A damaged or outdated Ethernet cable can significantly reduce your connection speed.
For example, an older Cat5 cable or a cable with damaged internal wiring may cause your computer to negotiate a 100 Mbps connection instead of 1 Gbps. Replacing the cable with a quality Cat5e or Cat6 cable is often an inexpensive way to eliminate this possibility.
Why is my Ethernet connection capped at 100 Mbps?
An Ethernet connection that's limited to 100 Mbps usually points to one of these issues:
- An older Cat5 cable
- A damaged Ethernet cable
- A router or switch with Fast Ethernet ports
- A network adapter that doesn't support Gigabit Ethernet
- A failed speed negotiation between your computer and router
Checking your Windows link speed is one of the quickest ways to confirm whether this limitation exists.
Does Ethernet always provide faster internet than WiFi?
In most situations, yes.
Ethernet offers lower latency, more consistent speeds, and greater reliability because data travels through a dedicated cable instead of wireless signals. However, if there's a bottleneck somewhere in your wired network, such as a faulty cable, outdated hardware, or incorrect settings, WiFi can temporarily outperform Ethernet until the underlying issue is fixed.
Should I replace my router if Ethernet is slow?
Not necessarily.
Before replacing your router, rule out simpler causes such as faulty Ethernet cables, outdated drivers, or incorrect network settings. If you've confirmed that your router only supports 100 Mbps LAN ports or another device connected to the same router experiences identical slowdowns, upgrading the router may be the best solution.
Will upgrading to a Cat6 cable make my internet faster?
A Cat6 cable won't increase the speed provided by your internet service provider.
However, it can remove a bottleneck if your existing cable is damaged, outdated, or unable to support Gigabit Ethernet. For most home users, both Cat5e and Cat6 cables are excellent choices for modern broadband connections.
Conclusion
An Ethernet connection that's slower than WiFi can be frustrating, especially when a wired connection is supposed to deliver the best possible performance. Fortunately, the problem is rarely caused by Ethernet technology itself.
In most cases, the slowdown comes from a bottleneck somewhere in your network. A damaged cable, outdated network driver, incorrect adapter settings, aging router, or hardware limited to 100 Mbps can all prevent your wired connection from reaching its full potential.
The most effective approach is to troubleshoot one component at a time. Start with the simplest fixes, such as replacing the Ethernet cable, checking your link speed, restarting your router, and updating your network drivers. Then move on to more advanced checks if necessary.
Once you've identified and removed the bottleneck, your Ethernet connection should once again provide the fast, stable, and low-latency performance it's designed to deliver.