Hi @zuyunluo86,
We recommend having a read of this community article which may help resolve your speed concern.
For WiFi issues, here are the articles that we've created to help you improve your home WiFi network.
If the issue persists, please send us a private message with your TPG account details together with your best contact number and most convenient time to receive a call for further troubleshooting.
To send a PM, please refer to this link: How do I private message (PM) in the community
