Start with the right question
When the office WiFi is slow, everyone blames the internet. But the internet — meaning your connection to your ISP — is often not the problem. The most common causes of slow office WiFi are: an underpowered router, poor access point placement, channel congestion from neighbouring networks, too many devices competing for bandwidth, or a network that was designed for five people and now serves twenty-five. Paying for a faster internet plan when the problem is your hardware is like buying a bigger fuel tank when your engine is misfiring.
Here's how to figure out which one is actually causing your problem.
Step 1: Test your internet speed at the router
Plug a laptop directly into your router or modem with an ethernet cable and run a speed test at fast.com or speedtest.net. Compare this to what you're paying for. If the wired speed matches your plan, your ISP is delivering. If it's significantly slower, that's a conversation to have with your provider — ask for their monitoring logs and escalate if needed.
If the wired speed is fine but WiFi is slow, you've confirmed the problem is in your network, not your internet plan. Now we can narrow it down.
Step 2: Check channel congestion
WiFi operates on radio frequencies — 2.4 GHz and 5 GHz bands. The 2.4 GHz band has fewer non-overlapping channels (effectively just 1, 6, and 11 in the standard configuration) and is shared with microwaves, Bluetooth devices, and every other business and apartment in your building. If everyone around you is on the same channel, you're all competing for airtime.
Use a free tool like WiFi Analyzer (Android) or the built-in Wireless Diagnostics on macOS to see what channels your neighbours are using. Set your router to use a less congested channel — or switch to 5 GHz, which has more channels and less interference, though shorter range. Most modern routers can do this automatically if you enable band steering.
Step 3: Is it one device or all devices?
If one person's laptop is slow and everyone else is fine, the problem is likely with that device — an outdated WiFi driver, a failing WiFi card, or too many background processes using bandwidth. If everyone is slow at the same time, particularly at peak hours, you're looking at a capacity or infrastructure problem.
Check if slowness is worse in certain parts of the office. Dead spots that correlate with physical distance from the router, or with walls and floors in between, indicate a coverage problem — not a speed problem per se, but one that presents the same way.
Range extenders vs proper access points
Range extenders (also called WiFi boosters or repeaters) are a tempting fix for dead spots. They're cheap and plug into the wall. They're also generally not appropriate for business environments. A range extender repeats your WiFi signal wirelessly, which means it halves the available bandwidth on that segment. Devices also struggle to roam smoothly between your main router and an extender, often staying connected to a weaker signal when a better one is available.
For a business, the right solution is either a mesh system (access points that communicate with each other and the router via a dedicated backhaul radio, maintaining full bandwidth to client devices) or wired access points connected to your router via ethernet cable (the gold standard — full bandwidth, reliable roaming, no radio congestion). If your building has ethernet cabling already, wired APs are almost always the better choice.
When to call someone vs fix it yourself
Basic channel changes, device restarts, and driver updates are reasonable DIY fixes. If your symptoms are: slow for everyone simultaneously, coverage gaps across more than one room, or performance that degrades under load, you're looking at either an infrastructure design problem or a capacity problem that a consumer-grade router won't solve. That's when it's worth getting a proper assessment. We offer these for businesses across the Queenstown region — see our Internet & WiFi service for details.
One last thing: update your router firmware
Router firmware updates often include significant performance improvements and security patches. Many small business routers ship with years-old firmware and are never updated. Check your router's admin interface (usually 192.168.1.1 or 192.168.0.1) and look for a firmware update option. Do this during off-hours — the router will restart.