Welcome to TPG Community!
Thank you for raising this concern to us. I've found your account using your Community details and ran remote tests. It appears that the problem is getting the result to show up on your devices. It's possible that the trouble you may be having could be WIFI-related if you're using a WIFI connection only. Compared to a wired connection, a wireless connection will always be slower, due to many environmental factors such as distance, Obstacles (walls, floors), electrical equipment (Cordless phones, microwaves may cause the wireless signal to degrade) and signal interference.
You might consider changing the wifi channel of the modem and we can have one of our Technical specialists to assist you. Kindly let us know of your most convenient time to receive a call so we can organise a contact to be made.
In the meantime, you may find these Community articles helpful: