In order to confirm if you are getting a slow connection speed, you may check this directly with your modem/router.
Are you using a WiFi or a Wired connection when you tested the speed? This article might help you troubleshoot the speed issue:
We also recommend on having a read on the following articles below:
If the issue persists, let us have your Customer ID/username via private message so we can have our Tech team to perform troubleshooting along with you.
Im on the nbn50 plan and cant get better upload speeds than 4.7mb/s. It says that I should be getting 20mp/s