What slows your internet down, and what you can actually fix

Internet speed depends on three separate things: the connection your provider sends to your house, the equipment inside your house that receives it, and what you are doing with it. Most people blame their provider when the real problem is equipment they can control, or too many devices pulling data at once. Before you call for service, test your actual speed, find where the slowdown happens, and try the fixes that match your situation.

Your provider advertises speeds like "100 Mbps" — that is the maximum the line can carry. You will not hit that number in real life. Wireless devices get less than wired ones. Multiple devices sharing the connection split the speed between them. Distance from the router, walls, and interference from other wireless networks all reduce what you actually see. The first step is measuring what you have right now, then deciding whether the problem is the line itself or something between the line and your device.

Key Takeaways

  • Test your actual speed at speedtest.net or fast.com while connected by ethernet cable to your router, with no other devices using the network, to see what your provider is actually delivering.
  • If the test shows you are getting close to your advertised speed, the slowdown is in your home network or on your device — not your provider's fault.
  • Moving your router to the center of your home, away from walls and metal objects, and keeping it off the floor makes the biggest difference for wireless devices.
  • Restarting your modem and router clears temporary memory problems that slow everything down, and should be your first troubleshooting step.
  • If your provider's speed test shows you are getting much less than advertised, the problem is the line itself and you may need to contact them or explore other providers.

Test your speed the right way

Speed test websites measure the connection between your device and the internet. Go to speedtest.net or fast.com and run the test, but do it correctly or the result will not tell you anything useful. Close all other programs and browser tabs. Make sure no one else is downloading, streaming video, or playing online games. If you are on wireless, move close to the router. Run the test three times and look at the middle result — the first one is often slow because the connection is warming up, and the third can be affected by heat.

The number that matters most is read speed, measured in Mbps. This is how fast data comes to you. Compare it to what your provider promises. If you are paying for 100 Mbps and the test shows 95 Mbps, that is normal — you will rarely hit the advertised number exactly. If you are getting 50 Mbps when you pay for 100, something is wrong. If you are getting 20 Mbps, the problem is serious.

Now run the test again, but this time plug an ethernet cable directly from your router to your computer. Ethernet is wired and does not have the interference problems wireless has. If the wired speed is much higher than the wireless speed, your router or its placement is the problem. If both speeds are low, the issue is the line coming into your house.

Restart your modem and router

A modem is the box that connects to your provider's line and turns the signal into internet your devices can use. A router takes that internet and broadcasts it wirelessly, or shares it over ethernet cables. Many people have both as separate boxes. Some providers give you a combined unit called a gateway. Restarting both clears temporary memory that builds up and slows everything down — it is the single most effective troubleshooting step and takes two minutes.

Unplug the modem from power. Wait 30 seconds. Plug it back in and wait for the lights to stop blinking and settle into a steady pattern — usually two to three minutes. Then unplug the router, wait 30 seconds, and plug it back in. Wait another two to three minutes for it to fully restart. Do not unplug them at the same time; the modem needs to reconnect to your provider's network before the router tries to use it.

After the restart, run your speed test again. Many slowdowns disappear after a restart because the equipment has cleared out temporary data. If speed improves noticeably, you are done. If nothing changes, move to the next step.

Move your router to a better location

Wireless signals weaken with distance and are blocked by walls, metal, and water. A router in a closet, in a corner, or on the floor will not reach the rest of your home well. The best location is in the center of your home, elevated off the floor — on a shelf or mounted on a wall — and away from metal objects like filing cabinets or the microwave. If your router is in a bedroom and you use the internet in the kitchen on the opposite side of the house, moving it to the hallway between them will help both rooms.

Avoid placing the router inside furniture, behind a TV, or near a cordless phone or baby monitor — these devices use the same wireless frequency and interfere with each other. If you cannot move the physical router, you can buy a mesh system, which uses multiple smaller units spread through your home to broadcast the same network. This costs more but works better in large homes or homes with thick walls.

After moving the router, test your speed again from the location where you use the internet most. If you are on wireless and the speed improves, the location was the problem. If you are on ethernet and nothing changed, the router location does not matter — your issue is the line itself or the modem.

Check how many devices are connected

Every device using your network shares the total speed. If you have 10 devices connected and someone is streaming video on one of them, the other nine split what is left. This is not a problem if only one or two devices are active, but it adds up fast. Check your router settings to see what is connected. Most routers have an app or a web address you log into — check the manual or the sticker on the back of the router for the address and default password.

Look for a list of connected devices. You may see phones, tablets, computers, smart speakers, security cameras, and smart home devices you forgot about. Disconnect anything you do not use regularly. Disable wireless on devices you use only occasionally. If you have guests over and they connect to your network, their devices stay connected and use bandwidth even when they are not actively using the internet. Ask them to disconnect or create a separate guest network they can use instead.

If you have many smart home devices or security cameras, they may be constantly uploading video or checking in with their servers. These devices do not need much speed individually, but together they can use a noticeable amount. If your internet is slow and you have many of these devices, try disconnecting a few and testing again to see if speed improves.

Change your wireless channel or switch to a different frequency band

Wireless routers broadcast on channels, similar to radio stations. If your neighbors' routers are on the same channel, they interfere with each other and slow everything down. Most routers automatically pick a channel when you set them up, but that channel may be crowded. You can manually switch to a less crowded one using the router's settings app or web interface.

Many modern routers broadcast on two frequency bands: 2.4 GHz and 5 GHz. The 2.4 GHz band travels farther and works better through walls, but it is more crowded because older devices use it. The 5 GHz band is faster but does not travel as far. If you are close to your router, switching to 5 GHz may give you better speed. If you are far away or have walls between you and the router, stick with 2.4 GHz or move closer.

To change channels, log into your router's settings. Look for wireless settings or channel selection. If you see a list of channels, try switching to channel 1, 6, or 11 on the 2.4 GHz band — these do not overlap with each other and cause less interference. Run a speed test after changing to see if it helps. If you have a newer router, it may have an option to automatically select the best channel, which usually works well.

Contact your provider if the line itself is slow

If your ethernet-connected speed test shows you are getting much less than your advertised speed, and restarting the modem did not help, the problem is the line between your house and your provider's network. This is not something you can fix yourself. Contact your provider and tell them your speed test results. They can run a test from their end and check whether the line has problems.

Providers sometimes have service issues in your area that they are already working on. Sometimes the line degrades over time and needs repair. Sometimes you are too far from the provider's equipment and need a different type of service. Ask them what the issue is and what options you have. If they cannot fix it or if you are unhappy with the speed available, you may be able to switch to a different provider — check what is available at your address on your provider's website or by calling competitors.

Before you switch, confirm that the new provider actually serves your address and that their speeds are better. Some areas have only one or two providers, so your options may be limited. If you have satellite internet or fixed wireless from a provider like Starlink or Verizon, the speeds available are different from cable or fiber, and moving the antenna or dish may help.

Frequently Asked Questions

Why is my speed fast on ethernet but slow on wireless?

Wireless signals weaken over distance and are blocked by walls and metal. Move closer to the router, move the router to a more central location, or switch to the 5 GHz band if you are close enough. If the problem is consistent in one room, that room may be too far from the router or have too many obstacles between it and the router.

Does restarting the router really help, or is that just what tech support says?

Restarting actually works because the router's memory fills up with temporary data that slows it down. After a few weeks of running continuously, a restart clears that out. It is not a permanent fix — you may need to restart every month or two — but it is the fastest way to get speed back temporarily.

Will a faster router make my internet faster if my provider's speed is slow?

No. A router can only broadcast the speed your provider sends you. If your provider gives you 50 Mbps, a new router will not make it 100 Mbps. A new router helps if your current one is old, far away, or not reaching all parts of your home, but it cannot exceed what your line can deliver.

What speed do I actually need for normal use?

For email, web browsing, and video calls, 10 to 25 Mbps is enough. Streaming video in high definition needs about 25 Mbps. Online gaming needs less speed but more stable connection. If multiple people are using the internet at once, add 10 to 15 Mbps per person doing something active.

Is my internet slow because of my computer, not my network?

Test from a different device on the same network. If the other device is fast, your computer is the problem — it may have malware, too many programs running, or a full hard drive. If the other device is also slow, the network is the problem. If you only have one device, restart it and close all programs before testing.