It is quite often the case that when a 500 or 1000 circuit is activated it is actually provisioned at a slower speed for a couple of days. It then goes to the CP to fully configure it, after that point you should get full speed. This is normally around 48 hours.
I'm quite sure others will say no this didn't happen to me, but that is the process
Never seen this once, ever.
It's absolutely not the process.
There are literally dozens of posts on here of people getting over 900Mb the minute their package has gone live.
You're talking waffle.
Agreed, when had got FTTP first installed with 300Mbits we got 317Mbits (down) and 30Mbits (up) as soon as the engineer sent the ONT Serial over, so I also say that's waffle.
But I did notice going from 300 to 900, when it switched over we were getting 300Mb (down) and 117Mb (up), we had no drop in connection nothing, so I instantly rebooted the router and we then ended up getting the full speed, maybe if I left it alone for a few mins it would of rebooted itself, so I must of noticed it exactly when it switched over.
But that doesn't mean that it provides at a lower speed at the start and then over a day or two bump the speed up, the change was within an several minutes of the switch over to me noticing and doing a reboot.
Paul