‘Slow Wi-Fi’ can mean two very different things: the internet coming into your home is slow, or the wireless link between your device and the router is slow. Telling them apart takes two minutes and decides everything you do next.
Step 1: Find out which part is slow
- Test next to the routerStand within a metre of the router and run a speed test. Note the download and upload numbers.
- Test where you normally use the deviceGo to your usual spot — sofa, bedroom, office — and run the same test.
- CompareSimilar numbers in both places, but lower than your plan: the bottleneck is your internet service or modem. A big drop in the second spot: the bottleneck is the Wi-Fi itself.
| What you see | Most likely cause |
|---|---|
| Slow everywhere, including next to the router | Internet plan, modem, or provider congestion |
| Fine near the router, slow further away | Wi-Fi range, walls, or interference |
| Fast then slow at certain times of day | Network congestion (yours or the provider’s) |
| Only one device is slow | That device’s adapter, drivers, or settings |
Common causes of slow Wi-Fi
Distance and building materials
Wi-Fi weakens quickly through walls, floors, and especially anything with metal or water in it (pipes, mirrors, aquariums, concrete). Every wall between you and the router can noticeably cut speed.
You are on the 2.4 GHz band
Modern routers broadcast two bands. 2.4 GHz travels further but is slower and crowded. 5 GHz is much faster but has shorter range. Many devices cling to 2.4 GHz even when 5 GHz is available.
Channel congestion
In flats and dense neighbourhoods, dozens of networks share the same handful of channels. When they overlap, everyone slows down.
Too many devices or heavy usage
A 4K stream, a big download, a game update and a video call at once will saturate most home connections regardless of Wi-Fi quality.
Old router or old device Wi-Fi
A router more than about five years old, or a laptop with an old wireless card, may top out well below your plan speed even with a perfect signal.
Interference from other electronics
Microwave ovens, cordless phones, baby monitors and some Bluetooth devices all sit in the 2.4 GHz range and can disrupt it while in use.
How to fix slow Wi-Fi
1. Restart the router (and do it monthly)
Unplug it for 30 seconds and plug it back in. Routers accumulate memory and heat issues over weeks of uptime; a monthly restart prevents a slow decline.
2. Move or reposition the router
- Central and elevated beats a corner on the floor.
- Out in the open, not inside a cabinet or behind a TV.
- Away from other electronics and large metal objects.
- Antennas (if external) one vertical, one horizontal.
3. Connect to the 5 GHz network
If your router shows two network names (often one ending in ‘-5G’), join the 5 GHz one on devices that are near the router. Keep 2.4 GHz for devices far away or outdoors. If both bands share one name, you can usually split them in the router’s admin page.
4. Change the Wi-Fi channel
- Open the router admin pageType 192.168.0.1 or 192.168.1.1 into a browser and sign in (credentials are on a sticker on the router).
- Find the wireless settingsLook for ‘Wireless’, ‘Wi-Fi’ or ‘Radio’ settings for each band.
- Set 2.4 GHz to channel 1, 6 or 11These do not overlap. For 5 GHz, ‘Auto’ is usually fine, or pick a high channel (149+).
- Set channel width2.4 GHz: 20 MHz for stability. 5 GHz: 80 MHz for speed.
5. Update the router firmware and your device’s Wi-Fi driver
Router firmware updates live in the admin page under ‘Administration’, ‘System’ or ‘Firmware’. On Windows, update the wireless adapter driver via Device Manager or your laptop maker’s support site. On a phone, install pending system updates.
6. Reduce what is using the connection
Pause big downloads and cloud backups during video calls. Check for devices you forgot about — a games console downloading updates overnight, a second TV streaming in another room.
7. Consider hardware if nothing else helps
- A mesh Wi-Fi system for homes where one router cannot cover every room.
- A Wi-Fi 6 (or newer) router if yours is old and you have many devices.
- A wired Ethernet run to a desktop or TV that needs consistent speed — see Ethernet troubleshooting if the wired link misbehaves.
What to check if it is still slow
- Test with an Ethernet cable straight into the router. If wired is fast and Wi-Fi is slow, it is definitely the wireless side. If wired is also slow, it is your plan or modem — contact your provider.
- Log the speed test results at different times over a day. Consistent slowness is hardware or plan; time-of-day slowness is congestion.
- Try one other device in the same spot. If it is faster, the original device’s adapter or drivers are the limit.
- Ask your provider whether your line is provisioned at the speed you are paying for — occasionally it is set wrong.
Common mistakes
- Judging Wi-Fi by a speed test on a device three rooms away — always test near the router too.
- Buying a ‘Wi-Fi booster’ before checking the band and channel; a repeater can halve throughput if used badly.
- Cranking 2.4 GHz to 40 MHz width in a crowded area, which increases interference.
- Assuming a faster plan will help when the Wi-Fi link, not the internet, is the bottleneck.