Every building seems to have one cursed corner where the Wi-Fi crawls, the back office, the far meeting room, the spot behind the thick wall. Before you rip anything out or spend a penny, there are a handful of things worth checking, roughly in order of effort. Most slow-corner problems are one of these six.
First, a quick sanity check: is it really the Wi-Fi and not the line? If everywhere is slow, not just one spot, run the cable test in our guide to Wi-Fi versus internet before reading on. If it is genuinely one area, carry on.
1. Access point placement
The commonest cause by far. Wi-Fi hates obstacles, and an access point shoved in a comms cupboard, under a desk or behind a metal cabinet is fighting with one hand tied behind its back. Mount access points high, out in the open, and reasonably central to the area they serve. Every wall, floor and large metal object between the AP and the desk chips away at the signal, and a single thick wall can be the whole story.
2. Channel congestion
Wi-Fi runs on channels, and if your kit and the businesses next door are all crowded onto the same one, they trip over each other. The 2.4GHz band is especially congested and only has a few non-overlapping channels, so lean on 5GHz where you can, and make sure your access points are on clear, sensibly spaced channels rather than all defaulting to the same one. In a busy area, this alone can transform things.
3. Transmit power
It feels obvious to turn the power up to reach further, but past a point it backfires. Cranking every AP to maximum makes them shout over each other, and it encourages devices to cling to a distant access point instead of hopping to a nearer one. In a multi-AP setup, balanced, slightly lower power often gives cleaner, more even coverage than everything blasting at full.
4. Interference
Plenty of everyday things pollute Wi-Fi: microwaves, cordless phones, Bluetooth gear, some cameras, and the building itself, foil-backed insulation, thick brick, large mirrors and metal shelving all block or reflect signal. If the bad spot is near a kitchen, a plant room or a particular wall, that is a strong clue.
5. Mesh problems
Mesh systems are convenient, but every wireless hop roughly halves the bandwidth available, because the node is talking to your device and back to the main router at the same time. A far-flung mesh node relying on a weak wireless link to the one before it will always feel sluggish. Where you can, wire access points back to the network with a cable rather than daisy-chaining them wirelessly, it is the single biggest upgrade to a struggling mesh.
6. Roaming and sticky devices
As you walk through a building, your phone or laptop should hand off from one access point to the next. Devices are often stubborn, though, clinging to the first AP they joined until the signal is almost gone. Proper business Wi-Fi tunes this with band steering and modern roaming standards so devices move cleanly, something a set of unmanaged home-style access points simply cannot coordinate.
The quick order to try. Move or re-aim the access point, switch the slow area to 5GHz and a clear channel, then look at power and interference. If it is a mesh, get that node on a cable. If the problem survives all that, it is time for a proper survey rather than more guesswork.
When it is time for a proper survey
If a spot keeps failing no matter what you try, guessing gets expensive. A site survey maps the actual signal and interference across your building and shows exactly where access points should go and how they should be tuned. That is the difference between scattering hardware and hoping, and designing coverage that just works, which we cover in our piece on high-density Wi-Fi.
How Synergy Max helps
We design business Wi-Fi properly: a survey to find the dead zones and interference, enterprise access points placed and tuned to cover evenly, and a wired backbone so no area is left on a weak wireless hop. No more cursed corner.