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.
In the event that the affected devices are connected Wireless/Wi-Fi connection, we recommend having a read on the following articles:
For us to further assist you, please send us a private message with your TPG customer ID, username and complete address so we can pull up the account.
To send a PM, please refer to this link: How do I private message (PM) in the community
Internet connection is generally suitable for its purpose, but it periodically slows dramatically for periods - at times that wouldn’t (to me) seem “peak”. I’ve tried restarting the modem, but it often makes no difference, and I don’t have a plan b. Uploads are sometimes comparatively good though.