get the fastest type of broadband available at your house. Standard broadband (ADSL) is fast, VDSL is faster, and UFB is the fastest.
A faster broadband connection can make all the difference. Standard ADSL and ASDL2+ broadband is fast, but upgrading to VDSL is like attaching a turbo. Fibre broadband is the way of the future though, with upgradeable speeds and better reliability and consistency.
make sure your router is placed either a) in the middle of your home and/or b) where you use WiFi the most.
The speed of your WiFi is reduced by distance, objects, walls, and interference from appliances. Placing your router In the middle of your gives you the best overall coverage area, but putting it where you use broadband more often will give you the best speeds in that location.
get a splitter installed and your wiring checked. Home wiring degrades over time and is a common cause of poor speeds.
A splitter isolates the broadband signal to reduce the chance of poor wiring or interference from reducing your speeds. A splitter is free with a VDSL upgrade (which is way faster anyway), or you can ask your ISP to arrange one, but because your home wiring is part of your property and not the Chorus network, there are charges involved.
use wired connections (Ethernet) instead of WiFi where possible.
WiFi speeds are rarely perfect because of distance and interference from other Wireless devices. Use an Ethernet connection wherever possible to get the max available speed.
rely on old modems/routers, computers and devices to give you the best possible speeds.
The older your device, the less likely it is to be able to support high speed wired or wireless connections, artificially slowing you down.