Hi @gDub . What type of NBN connection do you have? And what plan speed?
What model wifi router?
If it's a VR1600, can you check Advanced, Bandwidth Control. Is it enabled and is there a value for Upstream Bandwidth? (Other models will have similar function.)
Is your computer connected by ethernet or wifi? If wifi, what is the wifi connection speed?
Do this on your computer.
ping -n 20 192.168.1.1 (the local ip address of your router)
ping -n 20 www.tpg.com.au
tracert -d www.tpg.com.au