Fix slow home internet in Australia: 5 minute wired test first

The stream buffers. The call pixelates. You restart the router and hope. That hope wears thin. Most slow internet at home is one of two jobs: something in the house, or congestion outside it. A five minute wired test next to the router tells you which.

• Ask whether Wi-Fi is even the problem. Plug a laptop into the router with Ethernet. If that is fast, the line is fine. The wireless side is the mess.
• Ask when it happens. All day, or mainly 7pm to 11pm. Evening-only slowness is often busy-hour congestion, not a dying router.
• Ask which room. One dead corner with a strong test at the router is placement. Slow everywhere, including wired, is the plan or the cabling.
• Ask what you can log. Timestamped screenshots beat "it feels slow" when you ring your provider.

If you would rather not guess the ports, Network Scientist can map it. Sydney can start with Wi-Fi help across Sydney. Central Coast homes can use Wi-Fi help on the Central Coast.

Drops rather than slow speeds? That is Wi-Fi keeps dropping. Still setting the network up? Use home Wi-Fi setup.

How to test whether the problem is your home or your provider

Before you touch a setting, run the tests that actually tell you something. Guessing wastes an evening. A wired speed test next to the router gives you a clean baseline in minutes.

1. Plug a laptop or desktop into the router with Ethernet and run a speed test. That removes Wi-Fi from the equation.
2. Run the same test over Wi-Fi, standing near the router, then again from the room that usually crawls.
3. Compare both results to your plan's advertised speed. A big gap between wired and Wi-Fi is an in-home issue. A gap between wired and the plan is your provider.
4. Test at different times, especially 7pm to 11pm, and again first thing in the morning. Save screenshots with timestamps.

The Measuring Broadband Australia program has found some households are limited by in-home gear capped at 100 Mbps on the Ethernet ports, not by the plan at all. Do not only look at download speed. Latency, the delay before data starts moving, still wrecks video calls and games when the download number looks fine.

Why is my Wi-Fi slow in one room but not others?

Wi-Fi weakens every time it goes through a wall, a floor, or a big appliance. A router in a cupboard, behind the TV, or on the floor in a back room is already losing before it starts.

Placement that actually helps:

• Move the router to a central, elevated spot. A hallway shelf usually beats a corner of the study.
• Keep it away from microwaves, cordless phone bases, and baby monitors. They share 2.4 GHz with Wi-Fi.
• In a two-storey home, sit it near the stairwell so the signal has a shorter path both ways.
• Skip metal cabinets and fish tanks. Both block signal surprisingly well.

Most routers broadcast on 2.4 GHz and 5 GHz. Some newer ones add 6 GHz. 2.4 GHz travels further and punches through walls, which suits smart plugs and doorbells. 5 GHz is faster but shorter range, better for streaming, gaming, and calls when you are closer. If your phone is on 2.4 GHz while you sit next to the router, pick the 5 GHz name by hand.

Units and townhouses add neighbour routers on the same channels. Auto-select usually copes. A manual channel scan in the admin page sometimes helps in a crowded building.

Device count matters more than people expect. Fifteen smart gadgets, three streaming boxes, and a couple of laptops can choke an older router even on a fast plan. Choice's troubleshooting guidance points to Wi-Fi 6 or mesh once a household is that busy. For more than one stubborn room, mesh usually covers more evenly than a single extender bolted on as an afterthought. That choice sits in mesh Wi-Fi vs extender.

Pro Tip: Park big downloads, game updates, and backups overnight. That frees the evening for the things you are actually trying to do.

Is your router or cabling the actual bottleneck?

Sometimes the plan is fine. The problem is what connects to it. A modem turns the street signal into something your house can use. A router shares it. On FTTN or FTTB, the wall socket or Network Termination Device sits in front of both.

VDSL2 on FTTN or FTTB has a hard ceiling that depends on the copper run to your house. Old or damaged internal wiring drags that ceiling down. The ACMA recommends CAT5 or better cabling inside the home, and plugging the modem into the first phone socket on FTTN or FTTB, because that is usually the least signal loss. If you are still fighting the wrong nbn box, start with the wrong NBN device.

Check these before you blame the plan:

• Look at the Ethernet cable. A cheap or damaged CAT5 lead (not CAT5e or CAT6) can cap wired speed at 100 Mbps no matter what you pay for.
• Log into the router admin page and check for a firmware update. Old firmware causes real, measurable slowdowns.
• Check how many devices are connected, and whether any unfamiliar ones are hogging bandwidth.
• If the router is more than four or five years old, it may not support the speeds your current plan can do.

If you have swapped cables, updated firmware, and confirmed the router is not the ceiling, and speeds are still capped, the fault likely sits in the internal wiring or the NTD. That is a registered cabler or a technician, not a settings page.

Why is my internet slow at night, and is that normal?

Evening slowdowns are common, and often not a fault. Between about 7pm and 11pm, more homes on your street are streaming, gaming, and calling at once. The wholesale bandwidth your retail provider bought gets shared across more active users.

ACCC broadband performance data keeps showing busy-hour download speeds falling below advertised speeds, and it varies by provider depending on how much capacity they bought. nbn itself notes that evening congestion can be normal network behaviour, and recommends home setup checks first.

If it is slow every evening:

• Run timed speed tests at the same time each night for a week. That is evidence, not a one-off complaint.
• Keep screenshots with the date and time. Your ISP will ask for them.
• Ask your provider for an nbn fault check if wired tests show a genuine shortfall against the plan.
• If evening performance stays poor across several weeks, switching plans or providers often beats another round of troubleshooting.

Satellite services like Sky Muster carry higher latency than fixed-line or fixed-wireless. If you are regional, do not compare your ping to a friend on fibre in Sydney and assume your gear is broken.

When should you call a technician instead of troubleshooting yourself?

If you have run wired and Wi-Fi tests, power-cycled everything, and checked the cabling, and speeds are still well below what you pay for, it is worth someone looking at what is in the wall.

A technician can test at the first socket to see whether the fault is in the street or your wiring, check damaged or outdated cabling, and replace faulty NTD wiring where needed. Remote support covers router configuration, firmware, and guided speed tests when the problem is settings, background updates, or something quietly eating bandwidth.

Before you book, gather the speed logs with timestamps, which rooms and times are worst, and what you already tried. Wi-Fi weak in one room only is often one visit. Speeds capped everywhere, including wired, is a stronger sign of a provider or cabling fault. If you are in Newcastle or the Hunter, start with Wi-Fi help in Newcastle. Everywhere else in NSW can use the area list below, or call 0493 563 381.

Quick troubleshooting checklist to run right now

Run this in order before you call anyone. Most fixes land in the first three steps.

1. Power-cycle properly. Unplug the modem, wait 30 seconds, plug it back in and let it fully reconnect, then power-cycle the router the same way.
2. Run a wired Ethernet test next to the router. nbn's own guidance is reboot the modem or NTD first, then the router, in that order.
3. Move the router to a central, elevated spot and switch your device to 5 GHz if you are close to it.
4. Run a channel scan in the router admin page if you live in a unit or on a crowded street.
5. Isolate the problem device or room by testing Wi-Fi in different spots and noting the results.

If none of this helps, you already have the logs an ISP or technician will ask for.

Where to check the official numbers yourself

For a second opinion, ACCC broadband performance data shows how retail providers behave in busy hours. ACMA home internet guidance covers cabling standards and socket placement in more detail than most people need day to day. Choice's Wi-Fi troubleshooting guide and nbn's FAQ on service issues are both worth keeping if this comes back.

Our take: stop guessing, start logging

Most advice on slow home internet tells you to restart the router and hope. That is a fair first step. It is not troubleshooting. What separates a five minute fix from a week of frustration is evidence: a wired speed test, timestamped, repeated at the same time each evening.

The usual advice undersells how often the real fault sits in cabling or an old router rather than the plan. Households blame the provider for months when a CAT6 cable or a four-year-old box was the ceiling. Equally, plenty of people ring their ISP when the numbers show a normal busy-hour dip that everyone on the street is seeing.

Do the wired test first, always. It tells you in five minutes whether you are arguing with the right party. If it is clean and the fault is coverage or cabling, that is a physical, fixable problem. If it is slow everywhere including wired, that is a conversation for your provider, backed by logs rather than frustration.

Call 0493 563 381 if you want a person to look at the logs, the router, and the rooms that crawl. We will talk it through honestly, then help you take the next small step.

Sources

These pages help when you want the official wording:

• Improving your home internet - ACMA
• Measuring Broadband Australia report (Dec 2025) - ACCC
• Common Wi-Fi problems and how to fix them - Choice
• Resolving service issues: 8 FAQs answered - nbn