Why is my internet slow? How to improve your Wi-Fi speed

A how-to guide for troubleshooting slow Wi-Fi internet speeds.

The slow sitrep

So your internet is suddenly slow. Download speeds suck. Your connection is lagging. It happens. And Wi-Fi can be one of the biggest culprits. Where possible, use Ethernet instead of Wi-Fi: wired is more reliable and tends to be faster.

Not every device in the home has Ethernet support, though (and running cables around the house is its own challenge). The first thing to do outside of a wired connection is to check just how slow it really is. Run a speed test using Reviews AU’s Speed Test Tool.

External network factors

What you want to see is how slow your latency, download and upload speeds are compared to what your ISP is advertising your connection speed as. Bear in mind that the so-called internet ‘busy period’ is between 7.00pm and 11.00pm daily. There’s an acceptable level of fluctuation at these times.

If you’re on an NBN connection, your ISP has to advertise these expected evening speeds these days, so use that as a point of comparison. If you’re on an older technology type like ADSL2+, your upload and download speeds are linked: if you max out one, the other is throttled and slowed significantly.

On top of this, older broadband technologies like ADSL are reliant on a clear landline phone connection. Use a landline phone and listen at the dial tone for any background signal noise. If it’s there, contact your landline phone provider.

Whether you’re with Telstra, Optus or any other ISP, give them a call if speeds are below expected, particularly if your internet has suddenly slowed down. If your speeds are as advertised and your Wi-Fi is slow across the board, consider upgrading your plan.

The distance dilemma

Distance is detrimental to reliable Wi-Fi. The farther your Wi-Fi devices are away from your router, the more your connection diminishes. Try to place your router in a central position, or close to where the bulk of your wireless devices are used. Ideally, keep your router high and clear of objects.

There tend to be two Wi-Fi frequencies at play in the home, too: 2.4GHz and 5GHz. In terms of speed, all you need to know is 5GHz is fast at short ranges, and 2.4GHz is slower but offers greater Wi-Fi range. If your router only supports 2.4GHz, the chances are it’s older.

If you’re in a particularly large home, consider a router with increased Wi-Fi range, investing in powerline Wi-Fi internet expanders, or using a Wi-Fi extender to boost the signal. Certain routers can be converted to ‘repeating’ mode to use as ad hoc extenders, or you can invest in dedicated hardware.

Just remember to position the repeating router or extender at a strong part of the router’s Wi-Fi signal, not at the extremity of your main wireless network (or it’ll boost the signal at this weaker strength). Also consider that walls, particularly solid ones made of concrete and/or metal, will greatly impact Wi-Fi signals and will impact speed.

Outdated devices

The older your Wi-Fi device, the slower the speeds. Older routers also equate to slower maximum speeds. On top of this, there’s a partial alphabet of Wi-Fi standards that impact internet speeds.

An older router may not support newfangled Wi-Fi standards, which means that shiny new smartphone or tablet is throttled by the maximum potential speed of the router. It may be worth considering a router and/or device upgrade. Either way, be sure to keep your devices up to date. For wireless devices, this means relevant drivers and firmware; for routers, it’s firmware.

One of the biggest data hogs on Wi-Fi devices is driven by convenience. Applications and software may update as soon as a Wi-Fi connection is detected. This is particularly true of things like photo and video backups on smartphones and tablets. Keep an eye on cloud storage, too, like Google Drive, OneDrive and Dropbox.

If you’re on a Windows 10 PC (or earlier supported Windows operating systems), you can use software like CCleaner to check and disable potential bandwidth-hogging software, which may be automatically starting with Windows.

Slow Internet - WiFi Modem

Bandwidth band-aids

Every internet connection has a maximum amount of download and upload bandwidth. If this max potential is exceeded, your internet will slow down until that bandwidth is no longer in use.

The biggest culprit of bandwidth-hogging is likely other people using the same internet connection. Even with a 100Mbps internet connection, if all of that 100Mbps bandwidth is in use, all internet devices will be slowed, regardless of whether they’re on Ethernet or Wi-Fi.

Newer routers include a newfangled Quality of Service (QoS) feature that can be configured to manually or automatically prioritise certain internet traffic, devices or applications. This effectively frees up dedicated bandwidth for particular devices or online tasks.

It’s also worth ensuring you don’t have any unexpected devices connected to your Wi-Fi. Always use a secure Wi-Fi network with a password. Your mobile phone number (or someone else’s in your home) works as an easy-to-remember password that might deter internet freeloaders. Additionally, change your router password which, by default, tends to be a very common username/password combination.

Stopping the interference play

You may know that an operating microwave between router and Wi-Fi device can wreak wireless havoc. The reality is that any wireless device can cause interference that slows internet over Wi-Fi, particularly when nearby neighbours are using routers on the same Wi-Fi channel.

Try logging in to your router and switching the Wi-Fi channel away from its default: 1, 6 and 11 are great starting points. Finding a less popular or, ideally, an unused Wi-Fi channel can boost speeds.

Bluetooth also operates on the 2.4GHz frequency. While newer Bluetooth revisions are smarter at avoiding in-use wireless channels, keep the router clear of Bluetooth devices where possible. It’s also worth disabling Bluetooth on powered-on devices that aren’t using the wireless technology.

If all else fails, power cycle your devices and then your networking equipment. For homes with a separate modem and router, power down or unplug both. Wait at least 30 seconds. Then power on your modem first. Once it’s fully powered on with a Christmas tree of lights, power on your router. Oh, speaking of Christmas lights, those can slow down Wi-Fi: keep them clear of your router.

DNS Troubleshooting - Image of people dancing

DNS dancing

This is a bit more advanced, but for those comfortable digging into network settings, changing the DNS server settings can improve speeds. By default, your Wi-Fi device will default to the DNS servers of the ISP on a local network.

On Windows 10 devices, hit the Windows key and type in ‘view network connections’ then press ‘Enter’. Right click on your Wi-Fi network, then select ‘Properties’. Double click on ‘Internet Protocol Version 4 (TCP/IPv4), then select the bottom radial option that reads ‘Use the following DNS server addresses’.

There are many alternative DNS servers that can be inputted, but there are two popular choices. Try Google’s: (primary) and (secondary). Alternatively, there’s Cloudflare’s: (primary) and (secondary).

More advanced users can set the DNS setting at a router level so it will apply to every device connected via Wi-Fi. It should be found under LAN, WAN or DHCP settings. If you change your DNS server settings on a router, this will impact all connected devices.

It’s worth testing your Wi-Fi speeds after making changes to check for improvements. If it’s only one device in particular that’s slow, concentrate your troubleshooting efforts on that. If your entire Wi-Fi network is slow, the problem is likely either with your router or ISP.

This guide was produced by Reviews AU freelancer Nathan Lawrence. 

Still not happy? Consider upgrading to a faster plan

If none of the above solutions improve your broadband speed, it might be that your internet package is simply too slow. Here’s a quick look at the most popular nbn50 plans this week, according to WhistleOut’s comparison engine.