Welcome to the community!
Thanks for raising this to us. There are different types of speed issues that you may experience:
1. Speed issues caused by a line fault on TPG or NBN's network. Affecting all device(s) LAN/Wireless connected to the modem/router this may require a real-time test and investigation by our Technicians and Engineers.
2. Wireless Speed issue this issue only affects the device(s) connected via Wi-Fi which can easily be fix by doing adjustment to the modem/router's settings.
3. Speed issues caused by ongoing outage in your area.
I've managed to run remote test on your connection and have detected that your session is working for more than a month now which means the line is stable.
It's possible that the trouble you may be having could be WIFI-related (signal interference, distance, weak signal) if you're using a WIFI connection only.
We recommend having a read on the following articles:
If the issue still persists, send me a private message with your account details (Username/Customer ID together with the address on file) so we can proceed for further test and investigation.
My download speed is not very good, currently 11.5 and my upload speed is 0.9, my plan is a NBN25 standard plan which advertises 25mbs, can you explain why please? I have made no changes to any of my modem/router settings,