The device shows full bars and pages load slowly. Speed tests are a fraction of what you pay for. Moving closer to the router changes nothing.
Signal strength and throughput are different things. Bars measure how loudly your router is heard. They say nothing about how many other devices are shouting on the same frequency, and in a flat or a dense street that is usually the actual problem.
What changed in 2026
- 6GHz relieved congestion where available. Devices and routers supporting the newer band gained access to spectrum that is far less crowded, which is the most effective fix when both ends support it.
- Channel widths kept growing. Wider channels offer higher peak speeds and consume more spectrum, which makes the width decision more consequential in dense areas.
- Mesh systems spread and did not fix congestion. More access points on the same congested channels does not create more spectrum.
- Auto channel selection stayed unreliable. Routers still typically choose at boot and rarely reassess as the neighbourhood changes.
The bands, briefly
|
2.4GHz |
5GHz |
6GHz |
| Range |
Best |
Moderate |
Shortest |
| Wall penetration |
Best |
Moderate |
Weakest |
| Congestion |
Severe |
Moderate |
Low |
| Non-overlapping channels |
3 |
Many |
Many |
| Device support |
Universal |
Near-universal |
Newer devices |
2.4GHz travels furthest and through walls best, and it is badly congested. It carries every neighbour's network plus microwaves, cordless phones, baby monitors, and older smart home devices.
Crucially, on 2.4GHz only channels 1, 6, and 11 do not overlap. Any other channel partially overlaps two of them, which means a router on channel 3 interferes with everything on 1 and everything on 6 while getting a clean run at neither. Choosing 1, 6, or 11 — whichever is least used around you — is the single most effective 2.4GHz change.
5GHz has many non-overlapping channels and shorter range. For most devices in most homes, this is where you want them.
6GHz is the least crowded and has the shortest range, so it works best in the same room or with a mesh node nearby.
Channel width
Wider channels carry more data and occupy more spectrum, which makes them more likely to collide with neighbours.
In an isolated house, wide channels on 5GHz are straightforwardly faster. In a block of flats with a dozen visible networks, a wide channel overlaps most of them, and the resulting contention can make it slower than a narrow one that has clean air to itself.
The rule that follows: in congested environments, narrower is frequently faster. This is counterintuitive against a specification sheet where wider is always the bigger number, and it is easy to test — set a narrower width, run a speed test, compare.
On 2.4GHz, never use the wider option. It consumes most of the usable band and interferes with essentially every neighbour.
Finding what is actually around you
Guessing is unproductive. A Wi-Fi analyser app shows every network nearby, its channel, and its signal strength — free versions on Android are plentiful, and the picture takes a minute to read.
Look for which channels are busiest and how strong those competing networks are. A neighbour's network at a strong signal on your channel matters far more than a faint one three floors away.
Then set your channel manually. Automatic selection typically runs once at boot and does not reconsider, so the choice it made months ago may bear no relation to the current environment.
Two things worth knowing on 5GHz. Some channels are shared with radar systems and require the router to vacate if radar is detected, which causes brief dropouts — if your 5GHz occasionally disconnects for no visible reason, try a channel outside that range. And check what your devices actually support, since older ones cannot use the higher channels regardless of what the router offers.
Common mistakes
- Reading bars as speed. Signal strength is not throughput.
- Any 2.4GHz channel other than 1, 6, or 11. Interferes with two, cleanly uses neither.
- Widest channel width by default. Frequently slower in dense areas.
- Leaving auto channel selection. Chosen at boot, never revisited.
- Adding mesh nodes to fix congestion. More radios, same spectrum.
- Same SSID with a router placed badly. Devices cling to a distant access point; placement matters more than count.
- Ignoring wired options. Anything stationary and bandwidth-hungry should be wired if at all possible.
FAQ
Should I use one SSID or separate ones per band?
One name is more convenient and lets devices roam. Separate names give control over which band a device uses, which is occasionally useful for a device that stubbornly picks the wrong one. Start with one and split only if you have a specific problem.
Will a new router fix this?
Only if the problem is the router. A newer one supporting 6GHz genuinely helps by accessing uncongested spectrum. A newer one on the same crowded 2.4GHz channel contends for exactly the same air.
Why is my Wi-Fi slower in the evening?
Neighbours came home and their networks and devices became active. This is the clearest sign that congestion, not your equipment, is the constraint.
Is 6GHz worth upgrading for?
If you are in a congested area and your devices support it, it is the most effective single improvement available, because it is the only one that gets you spectrum nobody else is using yet.
Where to go next
For separating devices once the network is performing, read home network segmentation. For keeping the router itself current, router firmware updates, and for hardware selection, the best Wi-Fi 7 routers.