What actually slows down your internet, and what you can fix
Your internet speed depends on three things: the speed your provider sells you, the condition of the equipment between you and them, and what is happening on your network right now. You cannot change what your provider sells you without switching providers or paying more. But you can almost always improve the second and third — and those improvements are free or cost less than a month of service.
The most common culprits are a router placed in a bad spot, too many devices using the network at once, interference from other wireless signals, and equipment that is old or failing. Testing your speed first (as covered in the earlier guide) tells you whether the problem is your connection itself or something on your end. If your measured speed is close to what you pay for, the problem is almost certainly your setup or your devices.
Key Takeaways
- Move your router to the center of your home, away from walls and metal objects, to reach more devices with stronger signal.
- Restart your modem and router by unplugging them for 30 seconds — this clears temporary problems that slow speeds without warning.
- Reduce the number of devices actively using the network during speed tests or when you need fast speeds for one task.
- Change your Wi-Fi channel in your router settings if you live near other networks, because overlapping channels cause interference and slowdowns.
- If your router is more than five years old, replacing it may give you faster speeds even if your internet plan has not changed.
Move your router to a better location
Router placement matters more than most people realize. A router in a closet, behind a TV, or in a corner of your home will not reach the far side of your house, and walls — especially thick ones or those with metal studs — block the signal. Metal objects like filing cabinets, radiators, and even some refrigerators reflect and absorb wireless signals.
The best location is near the center of your home, elevated off the floor (a shelf or wall mount works), and away from large metal objects. If your modem and router are separate boxes, place them together. If you have a two-story home, put the router on the lower floor so the signal spreads upward as well as outward. Test your speed from the room where you use the internet most — if it is slow there, moving the router closer to that room will help more than moving it to the center.
If moving the router is not practical, a Wi-Fi extender or mesh system can reach dead zones. These are not free, but they cost $30 to $200 depending on the size of your home and the quality you choose. A mesh system (multiple small routers that work together) usually performs better than a single extender, but costs more.
Restart your modem and router
Restarting clears temporary problems that slow your connection without any obvious cause. Internet equipment can develop small glitches — memory leaks, stuck connections, overheating — that a restart fixes when ready. This is the first step to try when your speed suddenly drops.
Unplug your modem (the box that connects to your internet line) for 30 seconds, then 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 your 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; restart the modem first, then the router.
After the restart, run a speed test from the same location and device you used before. If your speed improves, the problem was a temporary glitch. If it does not improve, move to the next step.
Reduce the number of devices using the network
Every device on your network — phones, tablets, computers, smart TVs, security cameras, smart speakers — shares the available bandwidth. If five people are streaming video, downloading files, or playing online games at the same time, each one gets a smaller slice of the total speed. This is especially true on older routers or slower internet plans.
When you test your speed, make sure only one device is using the network. Close streaming apps, pause downloads, and ask others in your home to stop using the internet for a few minutes. If your speed improves dramatically when fewer devices are active, you know the problem is congestion, not your connection itself.
If congestion is the problem, you have a few options. You can ask people to use the internet at different times, move some devices to a wired connection (a computer plugged directly into the router with an ethernet cable will always be faster than Wi-Fi), or upgrade to a faster internet plan. A wired connection is especially worth trying for devices that need speed — gaming consoles, computers used for video calls or uploads, or streaming devices.
Change your Wi-Fi channel to avoid interference
Wi-Fi routers broadcast on channels, similar to how radio stations use different frequencies. If your router and your neighbor's router both use the same channel, they interfere with each other and both slow down. This is especially common in apartments or dense neighborhoods.
Most routers automatically choose a channel when you first set them up, but they do not change it if the neighborhood gets busier later. You can manually change the channel through your router's settings. Log into your router by opening a web browser and typing the router's IP address (usually printed on the router itself or in your manual — common addresses are 192.168.1.1 or 192.168.0.1). Look for a wireless settings or channel section.
Wi-Fi channels are numbered 1 through 13 in most countries (the United States uses 1 through 11). Channels 1, 6, and 11 do not overlap with each other, so they cause the least interference. If you are on a 5 GHz network (faster but shorter range), interference is less common and you have more channels to choose from. Try switching to a different non-overlapping channel and test your speed again after waiting a few minutes for the change to take effect.
Check for and remove devices using excessive bandwidth
Sometimes one device on your network is using most of the bandwidth without you knowing. A computer running updates, a phone backing up to the cloud, a security camera uploading video, or malware on any device can silently consume speed. Identifying which device is the culprit lets you stop it or move it to a wired connection.
Most routers have a way to see which devices are connected and how much data each one is using. Log into your router's settings (same process as changing the channel) and look for a connected devices, device list, or bandwidth usage section. The names and labels vary by router brand, but the information is usually there. If you see one device using far more data than the others, that is likely your problem.
Once you identify the device, you can disconnect it from Wi-Fi, move it to a wired connection if possible, or investigate why it is using so much bandwidth. A computer running a large software update or a phone backing up a huge photo library will use heavy bandwidth for a while and then stop — this is normal. If a device is constantly using heavy bandwidth for no clear reason, it may have malware or a problem that needs fixing.
Replace an old router
Routers have a lifespan. After five to seven years, they often slow down, lose connections, or cannot handle modern devices as well as newer models. If your router is older than five years and you have already tried the steps above, replacing it may be the most cost-effective fix.
A basic modern router costs $40 to $80 and will be faster and more reliable than an old one. A mid-range router ($100 to $200) offers better range and can handle more devices. If you have a large home or many devices, a mesh system ($150 to $400) spreads the signal more evenly than a single router.
Before you buy, check what speed your internet plan actually supports. If you pay for 100 Mbps, a $40 router will handle that fine. If you pay for 500 Mbps or higher, a better router makes a real difference. Your internet provider may also rent you a newer modem and router for a monthly fee — compare that cost to buying your own, since buying is usually cheaper over time.
Frequently Asked Questions
Why is my speed fast on one device but slow on another?
The device itself matters. Older phones or computers have older Wi-Fi hardware that cannot receive signals as fast as newer devices. Distance from the router also matters — a device far away will be slower. Try the slow device closer to the router. If it speeds up, the problem is signal strength, not your internet connection.
Does closing browser tabs or apps actually help?
Closing apps helps only if they are actively using the network — streaming video, downloading files, or syncing data. Closed apps or background tabs do not use bandwidth. If an app is running in the background and uploading or downloading, closing it will help. Otherwise, it makes no difference.
Will a Wi-Fi extender slow down my internet?
Yes, slightly. An extender receives the signal from your router and rebroadcasts it, which uses some of the available bandwidth. A mesh system is more efficient because the units communicate differently. If you need to cover a large area, a mesh system is worth the extra cost.
Should I use 2.4 GHz or 5 GHz Wi-Fi?
5 GHz is faster but has shorter range and does not pass through walls as well. 2.4 GHz is slower but reaches farther. Use 5 GHz for devices close to the router that need speed (computers, gaming consoles). Use 2.4 GHz for devices far away or in other rooms. Many modern routers broadcast both at the same time.
What if I have tried everything and my speed is still slow?
If your measured speed is much lower than what you pay for, the problem may be with your internet connection itself, not your equipment. Contact your provider and tell them your measured speed. They can check the line from the street to your home and may find a problem they can fix for free.