The 10 day training period is applicable to ADSL lines. VDSL tend to start as fast as it can, then move downwards if there are any stability issues, with DLM always lurking in the background.
I have been on TT fibre now for about 3 years.
With an HG635 my max. downstream was around 49 Mbps.
With an HG633 my max. download varied a bit. It was about 50 Mbps if it correctly recognised the availability of vectoring at my local cabinet, which it did with V1.21.1t firmware. For some reason V2.00t failed to recognise vectoring and my max. dropped to 43 Mbps.
With the new Sagemcom router I am getting 35 Mbps. A very significant drop from my old HG635 days.
Re-installing an old HG router recovers my performance levels.
So, IMO at least, something not quite right.
Edited by iefbr14 (Wed 04-Jul-18 22:18:46)