Hi there crombierv,
Welcome to the community,
Usually speed issues can be caused by a few reasons and could even have multiple causes, its best to try and narrow down where the probblem is coming from and what is causing it so that the issue can then be rectifed.
try this link it maybe be useful in helping you determine if your speed is low and how you may improve it.
For helpful tips on how to improve your internet speed, follow this guide at www.tpg.com.au/slowspeed
please let me know how you go