Welcome to the Community!
I've located your account using your Community details and has conducted series of tests.
Currently, the test results does not show a physical fault on the line outside and we would need to carry out simple checks to isolate and resolve this case.
Actual throughput speeds may be slower and could vary due to many factors including type/source of content being downloaded, hardware and software configuration, the number of users simultaneously using the network and performance of interconnecting infrastructure not operated by TPG. Devices connected by Wi-Fi may experience slower speeds than those connected by Ethernet cable.
Nonetheless, you may check these great articles at TPG Community with some helpful speed and Wi-Fi troubleshooting tips that may also assist you:
Should the issue persists, please let us know.