Your router can slow down your internet, but usually not as much as you think

Yes, your router affects your internet speed — but the effect depends on what router you have, how far you are from it, and what devices are connected. A newer router in good condition typically loses 5 to 15 percent of your connection speed. An older router, one placed in a closet, or one handling too many devices at once can lose 30 to 50 percent or more. The key is understanding where the slowdown actually happens so you can tell whether your router is the real problem or whether something else is.

Before you blame the router, know this: if your internet service provider (ISP) sold you a 100 Mbps connection and you measure 85 Mbps on a device sitting next to the router, the router is working fine. If you measure 40 Mbps, the router is part of the problem. If you measure 100 Mbps but your video calls stall and your downloads crawl, the router may still be the culprit — speed and performance are not the same thing.

Key Takeaways

  • A router's age, placement, and the number of devices connected all affect how much speed you lose between your ISP connection and your devices.
  • Routers older than five years, placed in enclosed spaces, or handling more than 10 simultaneous connections often cause noticeable slowdowns.
  • Measuring your speed directly from your modem (with an ethernet cable) tells you what your ISP is actually delivering; measuring from your router tells you what the router is passing along.
  • Interference from other Wi-Fi networks, microwaves, and cordless phones affects wireless speed more than the router's age in many homes.
  • A router restart often fixes temporary slowdowns, but consistent slowdowns usually mean the router needs repositioning, a settings change, or replacement.

How routers slow down your connection

Your router sits between your modem (which receives the signal from your ISP) and your devices. Every packet of data passes through the router's processor, which reads it, decides where to send it, and forwards it on. This takes time. A fast router does this in milliseconds; a slow one takes longer. The difference adds up when thousands of packets are moving at once.

The slowdown also depends on the type of connection. If you are using Wi-Fi, the router broadcasts your data wirelessly, which is inherently slower than a wired ethernet cable. Wi-Fi speed also drops the farther you are from the router and the more walls or metal objects are in between. A device in the next room might see 80 percent of the router's speed; a device two rooms away might see 50 percent.

Finally, routers have a limit to how many devices they can handle at once. A budget router from 2015 might slow down noticeably when five devices are streaming video simultaneously. A newer router can handle ten or more without much loss. If you have a smart home with cameras, doorbells, thermostats, and phones all connected, an older router will struggle.

Measuring what your router is actually doing

To know whether your router is the problem, you need two speed measurements. First, connect a computer directly to your modem with an ethernet cable (bypass the router entirely) and run a speed test at speedtest.net or fast.com. Write down the result. This is what your ISP is delivering.

Next, connect the same computer to your router with an ethernet cable and run the same speed test again. Compare the two numbers. If the second is within 10 percent of the first, your router is not the bottleneck. If it is 20 percent lower or more, the router is slowing you down.

Now test over Wi-Fi from the same room as the router. If this number is 30 percent lower than the wired test, that is normal — Wi-Fi is slower than ethernet. If it is 50 percent lower or more, you have a Wi-Fi problem. Move to a different room and test again. If the speed drops sharply, your router is not reaching that area well.

Router age and when replacement makes sense

Routers older than five to seven years often slow down because their processors are outdated and their Wi-Fi standards are older. A router from 2017 using Wi-Fi 5 (802.11ac) will be noticeably slower than a 2023 router using Wi-Fi 6 (802.11ax), especially if you have many devices. However, age alone does not may provide slowness — a well-maintained older router can still perform adequately if you have a modest number of devices and a fast ISP connection.

The real question is whether the slowdown matters to you. If you are paying for 50 Mbps and your router is delivering 40 Mbps, you probably will not notice. If you are paying for 300 Mbps and your router is delivering 150 Mbps, you will. Replacement makes sense when your speed tests show consistent loss and repositioning or restarting the router does not help.

Placement and interference problems

Where you put your router matters more than many people realize. A router in a closet, basement, or inside a cabinet loses 30 to 50 percent of its range and speed. Metal filing cabinets, refrigerators, and microwave ovens block Wi-Fi signals. Walls, especially those with metal studs or thick insulation, reduce signal strength. The best placement is central, elevated, and in open air — on a shelf in a hallway or living room rather than hidden away.

Interference from other Wi-Fi networks also slows you down. If you live in an apartment building or a dense neighborhood, your router may be competing for the same Wi-Fi channels as ten other routers. Most routers let you change the channel manually. If you are on Wi-Fi channel 6 and your neighbors are also on channels 5 and 7, switching to channel 1 or 11 can improve speed noticeably. Apps like Wi-Fi Analyzer (free on Android) or iStumbler (paid on Mac) show you which channels are least crowded.

Router settings that affect speed

Some routers come with settings that limit speed intentionally. Quality of Service (QoS) settings prioritize certain types of traffic — for example, video calls over downloads — but can slow overall speed if set too aggressively. Band steering, which automatically moves devices between the 2.4 GHz and 5 GHz bands, sometimes moves devices to a slower band. Beamforming, which focuses the Wi-Fi signal toward connected devices, usually helps but can cause problems with older devices.

Restarting your router clears its memory and often restores speed temporarily. If you notice slowdowns at the same time each day, a scheduled restart (many routers support this in settings) can help. However, if slowness returns within hours, the router itself is likely the problem, not a temporary glitch.

When it is not the router

Before replacing your router, rule out other causes. Your ISP connection itself might be slow — contact your provider and ask them to check your line. A virus or malware on one device can consume bandwidth and slow everything down; run a scan on your computer. Background updates on phones, tablets, or computers can spike bandwidth use; check your device settings. A neighbor's network congestion or a temporary outage at your ISP can feel like a router problem but will resolve on its own.

If speed tests show your router is delivering what your ISP promised, but your video calls stall or your downloads feel slow, the problem is usually not speed but latency (delay) or packet loss. These are different issues that a router restart or a change in Wi-Fi channel can sometimes fix, but they usually point to ISP problems or network congestion rather than a failing router.

Frequently Asked Questions

How do I know if I need a new router?

Run a speed test over ethernet connected to your router and compare it to a speed test directly from your modem. If the router is delivering less than 80 percent of what your modem receives, and repositioning or restarting does not help, replacement is worth considering. Also consider replacing if your router is older than seven years and you have more than ten devices connected regularly.

Does Wi-Fi 6 make a big difference?

Wi-Fi 6 routers are faster and handle more devices better than Wi-Fi 5, but only if your devices also support Wi-Fi 6. If your phone and laptop are Wi-Fi 5, a Wi-Fi 6 router will not speed them up. The benefit shows up mainly when you have many devices streaming or downloading at once.

Can I improve speed by changing the Wi-Fi channel?

Yes, sometimes significantly. If your neighbors' routers are using the same channel, switching to a less crowded one can improve speed by 20 to 40 percent. Use a Wi-Fi analyzer app to see which channels are in use around you, then change your router to channel 1, 6, or 11 (the non-overlapping channels on 2.4 GHz).

Should I use 2.4 GHz or 5 GHz Wi-Fi?

5 GHz is faster but has shorter range and is blocked more easily by walls. Use 5 GHz for devices close to the router that need speed, like a laptop for video calls. Use 2.4 GHz for devices farther away or in other rooms, like a smart speaker or security camera. Many routers let you use both at once.

Does restarting the router really help?

Yes, temporarily. Restarting clears the router's memory and can restore speed for hours or days. If slowness returns quickly, restarting is a band-aid, not a fix. If slowness returns after a week, a scheduled daily restart can help, but it suggests the router is aging or overloaded.