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

Internet speed depends on three separate things: what your internet service provider (ISP) sells you, what happens between their equipment and yours, and what your own devices and network are doing. Most people can fix the second and third categories without calling their ISP or paying more. The first category — your plan speed — is what you're actually paying for, and that one requires a plan change.

Speed slowdowns fall into two groups. Consistent slowness means your connection is always sluggish, which usually points to your plan speed being too low for what you're doing, or to a problem with the equipment between you and your ISP. Intermittent slowness means your connection works fine sometimes and crawls other times, which usually points to interference, too many devices using the connection at once, or something running in the background on your computer.

Key Takeaways

  • Your ISP's modem and router are the first place to check — restart both by unplugging them for 30 seconds, which fixes most temporary slowdowns.
  • Move your router away from walls, metal objects, and other wireless devices, or switch it to the 5 GHz band if your devices support it, because physical obstacles and interference slow wireless connections significantly.
  • Close programs running in the background on your computer, especially web browsers with many tabs open, because they consume bandwidth even when you're not actively using them.
  • Check how many devices are connected to your network — streaming video, downloads, and online games on other devices will slow everything else down.
  • If slowness is consistent even after these steps, contact your ISP to test your line speed and ask whether your plan speed matches what you're paying for.

Restart your modem and router

The modem is the box that connects to your ISP's line — it's usually provided by your ISP. The router is the box that creates your wireless network — it may be built into the modem, or it may be a separate device. Restarting both clears temporary glitches that slow your connection.

Unplug the modem first, wait 30 seconds, and plug it back in. Wait for all the lights to stop blinking and settle into a steady pattern — this usually takes two to three minutes. Then unplug the router, wait 30 seconds, and plug it back in. Wait for the lights to settle again. This single step fixes most temporary slowdowns, especially if you haven't restarted in weeks.

If the slowness returns after a few days, restart again. If it returns within hours, the modem or router may be failing and you should contact your ISP to request a replacement modem or consider replacing your router.

Position your router for better wireless signal

Wireless signals travel through air but are blocked or weakened by walls, metal, water, and other wireless devices. Where you place your router matters more than most people realize.

Place the router in an open, central location — ideally in the middle of your home rather than in a closet, cabinet, or corner. Keep it away from metal objects like filing cabinets, refrigerators, and microwave ovens. Keep it away from other wireless devices like cordless phones, baby monitors, and Bluetooth speakers, because they broadcast on the same frequencies and cause interference. Elevating the router on a shelf rather than placing it on the floor also improves signal reach.

If your router has a button or setting to switch between 2.4 GHz and 5 GHz bands, try the 5 GHz band if your devices support it. The 5 GHz band is faster but doesn't travel as far through walls, so it works best if you're in the same room as the router or in an adjacent room. The 2.4 GHz band is slower but travels farther, so use it if you need signal in distant rooms.

Close programs and browser tabs consuming bandwidth

Programs running in the background on your computer use your internet connection even when you're not actively using them. Web browsers with many tabs open, cloud backup software, streaming apps, and automatic update checkers all consume bandwidth.

Open your task manager (press Ctrl+Shift+Esc on Windows, or Activity Monitor on Mac) and look at the network column to see which programs are using your connection. Close web browsers with many tabs, pause cloud backup if it's running, and close streaming apps you're not watching. On Windows, you can also go to Settings > Network & Internet > Data usage to see which apps have used the most data recently.

Automatic updates often run in the background without you noticing. On Windows, go to Settings > Update & Security and check whether Windows Update is currently installing updates — if so, let it finish before testing your speed. On Mac, go to System Preferences > Software Update and check the same thing.

Check how many devices are using your network

Every device connected to your network shares your total bandwidth. If someone is streaming video, downloading files, or playing online games on another device, your own connection will be slower.

Log into your router's settings by opening a web browser and typing your router's IP address — usually 192.168.1.1 or 192.168.0.1, printed on the router itself. Look for a section called "Connected Devices" or "DHCP Clients" to see what's connected. If you see devices you don't recognize, they may be neighbors' devices connecting to your network, which means your network is not password-protected or the password is weak.

If you see devices you do recognize, ask the people using them to pause streaming, downloads, or games while you test your speed. If slowness goes away, you know the problem is too many devices using the connection at once — you may need a faster plan or a better router that handles multiple devices more efficiently.

Test your actual speed and compare it to your plan

Your ISP advertises a plan speed — usually something like "100 Mbps" or "1 Gbps". You can test whether you're actually getting that speed using a free online speed test.

Go to speedtest.net or fast.com in a web browser, close all other programs and browser tabs, and run the test. Write down the read speed and upload speed. Compare the read speed to what your ISP says you're paying for. If you're getting significantly less — for example, paying for 100 Mbps but getting 30 Mbps — contact your ISP and ask them to test your line. If you're getting close to what you're paying for, your plan speed may straightforward be too low for what you're doing.

Keep in mind that speed tests measure your connection at that exact moment. Run the test a few times at different times of day, because network congestion at your ISP can vary. If the speed is consistently much lower than your plan, or if it's fast sometimes and slow other times, contact your ISP with your test results and ask them to investigate.

Upgrade your plan or router if nothing else works

If your speed is consistently lower than your plan promises, and your ISP has tested your line and found no problems, your modem or router may be old and unable to handle faster speeds. Older routers especially can become a bottleneck — a router from 2015 cannot deliver gigabit speeds even if your ISP provides them.

Ask your ISP whether they recommend upgrading your modem. If they provide the modem, they may upgrade it for free or a small fee. If you own your router, consider replacing it with a newer model that supports the speed your plan provides — look for routers that support WiFi 6 (also called 802.11ax) if your devices support it.

If your plan speed is genuinely too low for your needs — for example, you're on a 25 Mbps plan but you have four people streaming video at once — contact your ISP and ask what faster plans are available in your area. Speeds and prices vary by location and provider, so there's no single answer, but most areas have multiple options.

Frequently Asked Questions

Why is my internet fast on WiFi sometimes but slow other times?

Interference from other wireless devices, distance from the router, or too many devices connected at once can cause WiFi to slow down intermittently. Try moving closer to the router or switching to the 5 GHz band. If slowness happens at specific times of day, someone else may be using the network heavily at those times.

Does restarting my modem really help, or is that just a myth?

Restarting genuinely fixes temporary slowdowns caused by memory leaks or connection glitches in the modem. It won't fix slowdowns caused by your plan speed being too low or by interference, but it's worth trying first because it takes two minutes and works often.

What's the difference between read speed and upload speed?

read speed is how fast data comes to you — what matters for streaming, browsing, and downloading files. Upload speed is how fast data goes from you to the internet — what matters for video calls, uploading files, and online gaming. Most plans have much faster read than upload.

Can I use a WiFi extender to improve my signal in distant rooms?

WiFi extenders repeat your signal to reach farther, but they cut your speed roughly in half because they use the same channel to receive and transmit. A mesh router system is better if you need coverage in multiple rooms — it uses multiple devices that work together and maintains better speed throughout your home.

Should I use a wired connection instead of WiFi?

A wired connection with an ethernet cable is always faster and more stable than WiFi because it has no interference or distance limitations. If you do speed-sensitive work like video calls or online gaming, plugging directly into the router with an ethernet cable will improve your connection noticeably.