How to Improve Your Wi-Fi

Why Wi-Fi performance varies so much around a home

A Wi-Fi signal is a radio wave, and radio waves weaken with distance and lose energy passing through physical materials. That is the starting point for almost every Wi-Fi problem: the further a device is from the router, and the more walls, floors and furniture in between, the weaker and less reliable the connection becomes, even if nothing is technically wrong with any piece of equipment.

It is worth being careful about assumptions here. A slow or inconsistent measurement does not automatically mean Wi-Fi is at fault — it could be the device you tested with, the internet connection itself, or something else on the network. The steps in this article are worth trying because they are free and often helpful, not because a slow result guarantees a Wi-Fi cause.

Router position, distance and building materials

A router placed in a cupboard, behind a television, or in a corner of the house sends most of its signal into things that block it rather than into the rooms where you actually use devices. A central, open location — ideally elevated, away from large metal objects and thick walls — generally gives more even coverage throughout a home.

Building materials matter more than people often expect. Plasterboard barely affects a signal, while brick, concrete, and especially materials like foil-backed insulation or metal studwork can cut a signal down substantially. Mirrors, radiators and large appliances can also reflect or block radio waves. If a particular room always seems to have poor Wi-Fi, the wall or floor between it and the router is a reasonable first suspect.

Signal attenuation

The natural weakening of a radio signal as it travels through the air and through obstacles. Every wall, floor and metre of distance attenuates a Wi-Fi signal by some amount, and the effect adds up quickly over a typical home's floor plan.

The 2.4 GHz, 5 GHz and 6 GHz bands, and interference

Most modern routers broadcast on more than one frequency band, and understanding the trade-off between them helps explain a lot of everyday Wi-Fi behaviour. The 2.4 GHz band travels further and passes through walls more easily, but it is slower, more crowded, and shared with many household devices such as older cordless phones, baby monitors and some microwave ovens.

The 5 GHz band offers more capacity and less interference but has a shorter effective range and struggles more with obstacles. The newer 6 GHz band goes further still in capacity and is currently far less congested, since fewer devices support it yet, but it has the shortest range of the three and needs a relatively unobstructed path to perform well.

Interference is not limited to your own devices. In apartment buildings and dense neighbourhoods, dozens of nearby Wi-Fi networks can be competing for the same limited channels, particularly on the 2.4 GHz band. This kind of congestion tends to show up as inconsistency — a connection that is fine one moment and sluggish the next — rather than as a permanently slow result.

Device placement and the number of connected devices

Where the device itself sits matters just as much as where the router sits. A laptop on the far side of a metal desk leg, or a phone left in a bag, can receive a noticeably weaker signal than the same device held in the open. Line of sight, or as close to it as practical, generally gives the best result.

The number of devices sharing a Wi-Fi network also matters, because they share the same limited airtime on the same channel. A household with many smart devices, streaming boxes and phones all active at once can experience slower and less consistent Wi-Fi even if no single device is doing very much, simply because everything is taking turns on a shared resource.

Restarting as a diagnostic step, and testing close to the router

Restarting a router can clear a genuinely stuck state — a memory leak, a confused connection table, or a temporary software fault — and it is a reasonable, low-cost thing to try. It is best thought of as a diagnostic step rather than a fix: if performance returns to normal after a restart and then degrades again over hours or days, that pattern itself is useful information, and repeatedly restarting is treating a symptom rather than the underlying cause.

Testing with your device sitting close to the router, ideally within the same room and with a clear line of sight, removes distance and most obstacles from the picture. If a close-range Wi-Fi test performs much better than a test from your usual spot, distance and obstacles are very likely playing a large role. If it performs about the same, the limitation is more likely to lie elsewhere — the router itself, the internet connection, or the device being tested.

None of this assumes your original test was even run over Wi-Fi. If you are not sure how you were connected, checking that first will save time — a wired test does not tell you anything about your Wi-Fi.

Comparing with Ethernet

The clearest way to separate a Wi-Fi problem from everything else is to test the same device over a cable, if it has an Ethernet port or can use a wired adapter. If a wired result is substantially better than a wireless one taken around the same time, that is strong evidence the wireless link was contributing to what you saw. If the two results are similar, Wi-Fi is probably not your main constraint right now, and it is worth looking at the internet connection itself.

Channels and settings, mesh systems, and the limits of Wi-Fi tuning

Most routers let you choose a channel within each band, and many can select one automatically. In congested areas, manually picking a quieter channel — one used by fewer nearby networks — can reduce interference, though the improvement varies by location and time of day. Keeping router firmware up to date is also worth doing, since manufacturers periodically improve how the radio and its scheduling behave.

For homes where a single router genuinely cannot reach every room well, mesh Wi-Fi systems and extenders exist to add coverage by placing additional access points around the space, working together as one network. Conceptually, they trade a small amount of complexity and cost for improved coverage in the areas a single router struggles to reach; whether that trade is worthwhile depends on the size and layout of your home, and is a decision worth making based on your own coverage map rather than a general rule.

It is also worth being honest about the limits of Wi-Fi tuning. If your internet connection itself has limited download or upload capacity, high idle latency, or a fault at the level of your provider, no amount of router repositioning or channel selection will fix that, because those issues exist before the signal ever reaches your Wi-Fi. This is exactly why comparing a Wi-Fi result with an Ethernet result on the same connection is such a useful first step — it tells you which category of problem you are actually dealing with before you spend time on either one.