Why Your Home Wi-Fi Is Slow and How to Fix It

Here is the first thing to know: when your Wi-Fi feels slow, the internet connection itself is often fine. The weak link is usually the last few metres, the wireless hop between your router and your phone. Fix the wrong thing and you can pay for a faster plan and still get buffering in the bedroom.

So the order matters. First work out where the slowness lives. Then fix that.

Step one: test wired, then wireless

This simple test settles whose problem it is, yours or your internet provider's.

1. Plug a laptop directly into the router with an Ethernet (LAN) cable. Thin laptops may need a USB LAN adapter.
2. Close other apps and run a speed test three or four times. Note the download and upload figures.
3. Unplug the cable and test over Wi-Fi, sitting right next to the router.
4. Finally, test over Wi-Fi in the room where the trouble is.

Now compare. Say your plan is 100 Mbps, purely as an example.

• Wired is well below 100 Mbps, again and again: the problem is probably the connection coming in. Restart the router and the fibre box (the ONT) if you have one, then raise a complaint with your provider, with screenshots of your results.
• Wired is close to 100 Mbps and Wi-Fi next to the router is good, but the far room is poor: it's a coverage problem. Most of this article is for you.
• Wired is good, but Wi-Fi is poor even next to the router: suspect the router, the device or interference. Try another phone or laptop to rule out the device.

Two small traps. Some older routers have LAN ports limited to 100 Mbps, which will cap a faster plan even on a cable. And a test at 9 pm, when the whole building is streaming, can look very different from one at 9 am. Test at a few different times before you decide. TRAI, the telecom regulator, also has its own speed-test app called MySpeed if you'd like a second opinion.

Where the router sits matters more than you think

Wi-Fi is radio. It spreads out from the router and gets weaker with distance and with every obstacle in the way. Yet routers usually end up wherever the installer brought the cable in: behind the TV, on the floor in a corner, inside a cupboard.

Better spots:

• Central. If you mostly use the internet in the living room and bedrooms, put the router between them, not at the far end of the flat by the front door.
• Off the floor. A shelf at chest height or higher usually does better than the floor behind furniture.
• In the open. Not inside a TV unit, a metal cabinet or a drawer.

If the cable point is in a bad spot, ask your provider to shift it, or use a longer LAN cable.

Walls, mirrors and other signal killers

Not all obstacles are equal. Homes with thick concrete and brick walls, which describes a lot of Indian flats, are much harder on Wi-Fi than homes with thin partitions.

• Concrete and brick walls, especially the walls around bathrooms, kitchens and staircases, absorb a lot of signal.
• Metal reflects and blocks it: steel almirahs, fridges, window grills and the reinforcing steel inside concrete.
• Mirrors have a thin metallic backing, so a large wardrobe mirror can behave like a shield.
• Water absorbs Wi-Fi signals, so an aquarium or a water tank between you and the router makes a difference.
• Microwave ovens work near the same 2.4 GHz frequency as some Wi-Fi and can disrupt it while they run.

Try moving the router a single metre and testing again from your problem room. Small changes often make a surprisingly large difference.

2.4 GHz vs 5 GHz: which band to use

Most modern routers broadcast on two bands, and sometimes show them as two networks, like “HomeNet” and “HomeNet_5G”. The “5G” there means 5 GHz. It has nothing to do with 5G mobile data.

A practical approach: use 5 GHz for anything in the same room or one wall away, and let far-off devices fall back to 2.4 GHz. Many routers combine both bands under one name and steer devices automatically. If that steering misbehaves, splitting them into two names gives you control.

The apartment problem: channel congestion

Open the Wi-Fi list on your phone in a typical apartment block and you may see twenty networks. They all share a limited set of channels. On 2.4 GHz there are only three channels that don't overlap each other, usually 1, 6 and 11. When several neighbours sit on the same channel, devices have to take turns, and everyone slows down, especially in the evening.

What helps:

• Move as many devices as you can to 5 GHz. It has many more channels, and its shorter range means your neighbours' signals bother you less.
• Open your router's settings page (the address is usually printed on a sticker on the router) and look at the channel setting. Auto is fine for most routers. If it seems stuck on a busy channel, try 1, 6 or 11 on 2.4 GHz.
• Restart the router now and then. Many routers pick a fresh channel when they start up.

Extenders vs mesh: fixing dead zones

If the router is well placed and one room is still weak, you need a second access point. There are two common ways to get one.

A Wi-Fi extender, also called a repeater, is a small box that plugs into a wall socket, picks up your router's signal and rebroadcasts it. It's cheap and easy. The catch is that many simpler extenders use the same radio both to listen to the router and to talk to your device, which can cut the speed in that room a lot. They often create a separate network name too, so your phone may cling to the weaker one. Placement decides everything: put it halfway, where the signal is still decent, not in the dead room itself.

A mesh system uses two or more matching units that work as one network with a single name. Your phone switches between them as you walk around, and better systems keep a dedicated radio link between the units, so speed holds up well. It costs more, but for a large flat, a duplex or a house with several floors, it usually beats a chain of extenders.

The best option, if you can manage it, is a cable. Run Ethernet to the far room and put a second access point or mesh unit there. A wire between units beats any wireless link.

A checklist before you call anyone

• Run the wired vs wireless test, at more than one time of day.
• Restart the router and the fibre box.
• Move the router somewhere central, off the floor and in the open.
• Use 5 GHz for nearby devices and keep 2.4 GHz for distance.
• Pause heavy background use, like cloud photo backup.
• Update the router's firmware if its settings page offers an update.
• If the router is several years old and was the free one from your provider, ask whether a newer model is available.
• Only then think about extenders or mesh, and only after that about a faster plan.

The one idea to keep: test before you spend. A cheap LAN cable and ten minutes of testing will tell you whether your money belongs with your provider or with a better spot for your router.