Slow Wi-Fi is one of those things that makes ordinarily calm, rational people want to throw a router out of a window. I know this from personal experience. There have been evenings in our house where one kid is trying to game online, another is streaming something on Netflix, someone else is on a video call, and I’m trying to get some work done. Suddenly everything grinds to a halt. The Wi-Fi symbol is mocking you. The buffering wheel is spinning. Nobody is happy. And every single person in the house is convinced it’s someone else’s fault.
The frustrating part is that slow Wi-Fi is almost never one single thing. It’s usually a combination of factors. Where your router is sitting, how many devices are fighting for bandwidth, whether your neighbours’ Wi-Fi is trampling all over yours, or whether the problem isn’t even your network at all. It’s your ISP. I’ve spent a fair amount of time sorting this out properly at home, and I want to walk you through exactly how I’d diagnose and fix it, step by step.
Before You Start
A quick word before you dive in. If you’re renting your router from your ISP, some settings may be locked down or limited. You can still do a lot of the steps here, but you may not have full access to advanced channel controls. Also, if you’ve recently had a power cut, or your ISP has flagged an outage in your area, some of this could be moot until that’s resolved. Worth checking your ISP’s service status page first, just to rule that out.
Step 1: Run a Speed Test and Establish a Baseline
Before you move anything, change anything, or blame anyone, you need actual numbers.
Plug your laptop or PC directly into your router using an Ethernet cable. Then go to fast.com or speedtest.net and run a speed test. Write down what you get. This is your baseline, the speed arriving at your router from your ISP, before Wi-Fi even comes into the picture.
Now disconnect the cable, move to the room where your Wi-Fi feels slowest, and run the same test over Wi-Fi. Write that number down too.
Here’s a useful anchor point: Wi-Fi speeds are typically 20 to 50 per cent slower than a wired connection, even under good conditions. That’s just physics. But if your Ethernet test is showing, say, 150 Mbps and your Wi-Fi in the next room is showing 12 Mbps, that’s not physics. That’s a problem worth solving.
If your Ethernet speed is also slow and doesn’t match what you’re paying for, skip ahead to the ISP section. The rest of the network fixes won’t help if the problem starts at the source.
Step 2: Sort Out Your Router Placement
This is the one that surprises people the most, because it’s not glamorous, but it makes an enormous difference. Poor router placement can reduce your speed by up to 50 per cent or more.
Most people put their router wherever the engineer installed it, which is usually near the front door, tucked into a corner, or hidden in a cupboard somewhere. That’s almost always the worst possible place.
Here’s what you should do instead:
Move your router to a central location in your home. Wi-Fi signals broadcast in a dome-like pattern in all directions, so if your router is at one end of the house, the other end is getting the weakest possible signal.
Get it up high. Seriously. Put it on top of a bookshelf, mount it on a wall, whatever it takes. Higher placement improves coverage significantly.
Keep it in the open. Not in a cupboard, not behind the TV, not wedged behind a sofa. Every wall, door, and solid object the signal has to travel through reduces its strength. Metal objects are particularly bad at this.
Keep it away from interference sources. Microwaves, cordless phones, and Bluetooth hubs can all mess with your Wi-Fi signal, especially on the 2.4 GHz band. Give your router some space from those.
One thing I’d flag. If you’ve seen those videos on social media about making a Wi-Fi reflector out of aluminium foil to boost your signal, please don’t bother. It doesn’t work. You’ll just scatter the signal randomly and make things worse.
Step 3: Check Your Wi-Fi Bands and Channel Congestion
Modern routers broadcast on multiple frequency bands, typically 2.4 GHz and 5 GHz, with newer hardware also supporting 6 GHz. Each has a different job.
- 2.4 GHz: Better range, better at going through walls, but slower. Maximum over-the-air speed is around 100 Mbps, and it’s the most congested band because everything uses it.
- 5 GHz: Faster (up to 1 Gbps), but shorter range and more affected by walls. Great for devices close to the router.
- 6 GHz: Only available on newer devices and routers, but far less congested because fewer devices use it yet.
The general rule is simple: put devices that need speed and are near the router on 5 GHz. Put smart home gadgets, older devices, and anything far from the router on 2.4 GHz.
Now for channel congestion. On 2.4 GHz in particular, there are only three non-overlapping channels: 1, 6, and 11. In a densely populated street, all your neighbours are fighting over the same three channels. It can get messy.
Download a free Wi-Fi analyser app to see what’s going on. Wi-Fi Analyser is free on Android, and NetSpot works well on Mac and PC. These tools show you a map of every Wi-Fi network nearby, what channels they’re on, and how much signal they have.
If you can clearly see that one channel is far less congested than your current one, log into your router admin panel (usually at 192.168.1.1 or 192.168.0.1 in your browser), find the wireless settings, and switch to that channel. However, if the analyser doesn’t show an obvious winner, leave your router on auto channel selection. Modern routers are reasonably good at picking this themselves, and manually forcing a channel can sometimes make things worse.
Step 4: Consider a Mesh Network If Your Home Is Large or Multi-Storey
A single router is simply not designed to cover a large or multi-storey home reliably. If your house has thick walls, multiple floors, or awkward layouts, a mesh network is the proper solution.
I run a Deco X60 and Deco M5 mesh system at home, and the difference compared to a single router is dramatic. Mesh systems use multiple nodes that communicate with each other and your devices seamlessly. Your phone or laptop hands off between them without you noticing.
If you’re in the market and want to future-proof things a bit, it’s worth looking at Wi-Fi 6 or Wi-Fi 6E hardware. Wi-Fi 7 was officially standardised in September 2024, and certified hardware is now available. It introduces Multi-Link Operation (MLO), which lets devices connect to multiple frequency bands simultaneously and dodge congestion automatically. That said, Wi-Fi 6 mesh gear represents excellent value right now for most families.
Step 5: Restart and Update Your Router
It sounds obvious, but a router restart clears memory, resets connections, and often delivers a noticeable speed improvement. Power it off, wait 30 seconds, and power it back on. Do this monthly as a habit.
Also check whether your router has a firmware update available. Log into the admin panel, find the firmware section, and update it if one is available. Manufacturers push performance and security improvements through firmware, and many people never install them.
Step 6: Rule Out Your ISP
If you ran that initial Ethernet speed test and the result was significantly below what your contract promises, the problem isn’t your network. It’s your ISP.
Call them and ask them to run a line test. In the UK, every premises has the legal right to request a connection of at least 10 Mbps download and 1 Mbps upload under the Universal Service Obligation, though most modern contracts promise considerably more. If you’re consistently getting less than your agreed speed, your ISP is obligated to investigate.
Keep a record of your speed test results at different times of day before you call. If the speeds are only slow in the evenings, that points to network congestion on your ISP’s side. If it’s slow all the time, it could be a line fault or a problem with your router itself.
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If It’s Still Not Working
If your Ethernet speed is fine but Wi-Fi is still slow after repositioning the router: Try a factory reset on the router and set it up fresh. Sometimes old settings cause issues that a reset clears out.
If speeds vary wildly throughout the day: This is almost always ISP congestion rather than a home network issue. Document it and escalate to your provider.
If one specific device is slow but others are fine: The problem is with that device, not your network. Check for driver updates, try forgetting and reconnecting to the Wi-Fi, and restart the device.
Getting your home Wi-Fi properly sorted isn’t complicated, but it does take a methodical approach. Test first, then fix one thing at a time rather than changing everything at once. Work through these steps and you should see a real improvement. If you’re still stuck after all of this, drop me a message or come and ask in the Tech Dads Life newsletter community. There’s usually someone who’s seen the same problem.
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