Welcome to the community!
The speed of your service should be normal once installation is done, if you're on ADSL2+ it will depend on the attainable sync speed of your location based on distance from the exchange else if you're on NBN it should depend on your chosen NBN plan speed (For FTTB and FTTN customers, it will also depend on the attainable maximum line sync speed).
I tried to use your community details to pull up the account unfortunately no match. To better understand your service connection I'd like to get your account details (Username/Customer ID and the address associated with the account).
In case you need a reference: How to send a PM.