Yesterday I upgraded our internet from Fibre Essential to Full Fibre 900. We was originally getting something like 35 down, 10 up on average. After the upgrade and new router, I started with 500 down, 97 up, which was still quite poor considering. However, it's now on average 45 down, 45 up (wired). I've noticed it's just reduced speed throughout the day.
Do I need to wait out the 10 days with reduced speeds for it to "stabilise" or is there a fundamental problem?