What actually slows down your internet

Internet speed depends on three separate things: your connection type, how many devices are using it at once, and what's happening between your device and the website or service you're trying to reach. Most people blame their internet provider when the real culprit is one of the other two. Before you call for help, you need to know which one is the problem.

Your connection type — cable, fiber, DSL, or satellite — sets a hard ceiling on speed. You cannot exceed what your plan includes, no matter what you do. But you can fall well short of it. A device downloading files in the background, a neighbor's network interfering with yours, or a router placed in a closet will all make your actual speed much slower than what you're paying for.

Key Takeaways

  • Run a speed test on your device while standing near your router to see what speed you're actually getting, then compare it to your plan's advertised speed.
  • Move your router to a central, elevated location away from walls and metal objects, and keep it away from microwaves and cordless phones that use the same radio frequencies.
  • Restart your router by unplugging it for 30 seconds, then plugging it back in — this fixes most temporary slowdowns without any other work.
  • Close background apps and browser tabs that are downloading or streaming, and check whether other people on your network are using video or file-sharing services.
  • If your speed test shows you're getting less than 80 percent of what you're paying for, contact your provider with the test results as proof.

Test your actual speed first

Before you change anything, measure what speed you're actually getting. Go to Speedtest.net or Fast.com on any device connected to your network. Stand within 10 feet of your router and run the test. Write down the download speed, upload speed, and ping time.

Compare those numbers to your internet plan. If you pay for 100 Mbps download and the test shows 80 Mbps or higher, your connection is working as intended — the remaining gap is normal. If you're getting 60 Mbps or lower, something is wrong. Run the test again at different times of day, because speed can vary depending on how busy your provider's network is.

If you have a wired connection available, plug an ethernet cable directly from your router to your device and run the test again. If the wired speed is much faster than the wireless speed, your Wi-Fi signal is the problem. If both are slow, your internet plan itself is the issue.

Restart your router and modem

Unplug your modem (the box that connects to your wall outlet and your internet provider's network) and your router (the box that broadcasts Wi-Fi) for 30 seconds. Plug the modem back in first and wait for its lights to stop blinking and settle into a steady pattern — this usually takes two to three minutes. Then plug in the router and wait another two to three minutes for it to fully start up.

This clears temporary problems that slow down your connection without requiring any other changes. Many internet slowdowns are caused by your equipment getting stuck in a confused state, and a restart fixes it. If your speed improves noticeably after this step, you may only need to restart your equipment once a week or once a month to keep things running smoothly.

Move your router to a better location

Router placement has an enormous effect on Wi-Fi speed and range. Place your router in a central, elevated location — a shelf or wall mount in the middle of your home works better than a closet or corner. Avoid placing it on the floor, inside a cabinet, or behind a TV. Walls, especially thick ones or those with metal studs, block the signal significantly.

Keep your router away from other electronics that use radio frequencies on the same band. Microwaves, cordless phones, baby monitors, and some older wireless speakers all interfere with Wi-Fi. If your router is sitting next to a microwave, move it at least six feet away. Antennas should point in different directions — if your router has two or three antennas, point one up, one sideways, and one at an angle.

If you live in an apartment or a house where a central location is impossible, consider a mesh Wi-Fi system instead of a single router. Mesh systems use multiple smaller units placed around your home to extend coverage, and they work together to keep your connection stable as you move between them.

Close apps and browser tabs using bandwidth

Check what's running on your device. Open your task manager on Windows (press Ctrl+Shift+Esc) or Activity Monitor on Mac (press Command+Space, type "Activity Monitor", and press Enter). Look for apps using high CPU or network activity — cloud backup services, file-sharing apps, streaming services, and torrent clients are common culprits. Close the ones you're not actively using.

In your browser, close tabs that are streaming video, downloading files, or loading heavy websites. A single video stream can use 5 to 25 Mbps depending on quality, which leaves little for other tasks. If you have multiple browser windows open, close the ones you're not using.

Ask other people on your network whether they're streaming video, downloading large files, or playing online games. Each of these activities uses significant bandwidth, and if multiple people are doing them at once, everyone's speed suffers. If you need consistent speed for work or school, ask others to avoid heavy usage during those times, or use a wired connection so you're not competing for Wi-Fi bandwidth.

Check your Wi-Fi channel and switch if needed

Wi-Fi routers broadcast on channels, and if your neighbors' routers are using the same channel, they interfere with each other. Most routers automatically pick a channel when they start up, but they don't always pick the best one.

Download a free app like WiFi Analyzer (Windows) or iStumbler (Mac) to see which channels your neighbors are using. Log into your router's settings by opening a browser and typing 192.168.1.1 or 192.168.0.1 (check your router's label for the exact address). Look for the Wi-Fi settings or wireless settings section and change the channel to one that's less crowded. Channels 1, 6, and 11 are the standard non-overlapping options on the 2.4 GHz band — pick whichever one shows the fewest nearby networks.

If you have a newer router that supports 5 GHz Wi-Fi, switch to that band instead. The 5 GHz band has more channels available and less interference from household devices, though it doesn't travel as far through walls. Many routers broadcast both bands at once, so you can connect devices that need range to 2.4 GHz and devices that need speed to 5 GHz.

Update your router firmware and device drivers

Router manufacturers release firmware updates that fix bugs and improve performance. Log into your router's settings and look for an administration, maintenance, or system section. Check for available updates and install any that are waiting. This usually takes a few minutes and may require a restart.

On your computer, make sure your network drivers are current. On Windows, open Device Manager (press Windows key + X and select Device Manager), find Network adapters, right-click on your Wi-Fi adapter, and select Update driver. On Mac, software updates usually include network driver updates — go to System Preferences, then Software Update, and install any available updates.

When to contact your internet provider

If your speed test shows you're consistently getting less than 80 percent of your advertised speed, and you've tried restarting your equipment and moving your router, contact your provider. Have your speed test results ready to show them. Many providers will send a technician to check your connection for free if you're not getting the speed you're paying for.

Before you call, write down the exact speeds you measured, the time of day you tested, and which tests were wired versus wireless. Providers often ask these questions, and having the answers ready speeds up the process. If the technician finds a problem with the line coming into your home, they'll fix it at no charge. If the problem is your equipment, they may offer to replace your modem or router for a fee.

Frequently Asked Questions

Why is my internet fast on one device but slow on another?

The device itself might be the problem — older devices have older Wi-Fi hardware that doesn't support faster speeds. Try connecting the slow device with an ethernet cable to see if it's the device or the Wi-Fi. Also check whether that device is running background apps or has many browser tabs open.

Does changing my Wi-Fi password make internet faster?

No, but it can help if someone else is connected to your network without permission. If an unauthorized person is using your bandwidth, changing the password and reconnecting your own devices will free up speed. Use a strong password with uppercase, lowercase, numbers, and symbols.

Will a Wi-Fi extender or booster fix my slow internet?

A Wi-Fi extender can improve signal in dead zones, but it doesn't increase your actual internet speed — it just spreads the same speed over a larger area. If your whole home is slow, an extender won't help. A mesh system is better because it maintains faster speeds across your home.

Is satellite internet slower than cable or fiber?

Yes, satellite internet has higher latency (delay) because signals travel to space and back, which affects video calls and online games even if the download speed looks good on a test. Cable and fiber are faster and more reliable for most uses.

How often should I restart my router?

If your internet is working well, you don't need to restart it regularly. If you notice slowdowns happening at the same time each day or week, try restarting once a week at a time when you're not using the internet. Some people set their router to restart automatically at 3 a.m. using the router's built-in scheduling feature.