Plusnet fibre started at 3Mbps, now 35Mbps - why?

Elder son has just gone from Plusnet ADSL to Plusnet fibre, he's only a hundred metres or so from the cab so potentially going to get close to max. speed.

I asked him what speed he was getting, he replied "around 3Mbps download, and 1.5-2Mbps upload" (using the TBB speed tester and over wWiFi). I gently suggested that was appalling, and not worth the fibre premium, assuming he was actually using fibre - though upload speeds suggest he was.

I suggested he rerun using ethernet to eliminate WiFi issues. He also rang Plusnet late this afternoon, got through almost immediately. The Plusnet rep. looked at his line (or whatever) and "changed a few settings", he was told to wait 20-30 minutes and see if things were better.

He's now getting, via ethernet, 35Mbps+ download, 1.8Mbps upload. Clearly much better. I've asked him to try WiFi speed test for comparison.

Assuming it was a Plusnet setting issues, any idea what that might have been?

the current line speed -this is a mirror of the BT IP Profile - https://portal.plus.net/my.html?action=data_transfer...
It is likely the ADSL profile hadn't been updated

Would that have happened naturally in due course or is it that it sometimes gets stuck at the old setting?

It should have happened naturally but it's not unheard of for it to get stuck.

In reply to a post by Oldjim:

the current line speed -this is a mirror of the BT IP Profile - https://portal.plus.net/my.html?action=data_transfer...
It is likely the ADSL profile hadn't been updated

Yeah a distorted one too

I went from ADSL to fibre on Plusnet - for a week I was getting 2 Mbs down (same as I was on ADSL) and 18 Mbs up - but they seem to totally mess up my order so I had to chase a couple of times, to get it all sorted (at least I wasn't charged fibre costs during that period)

To correct my mistake in the OP, he used on-line chat to talk to Plusnet rather than phoning them.

The outcome was what mattered though.

Is it a problem peculiar to Plusnet or do other ISPs have the same or similar problems?

In reply to a post by cheshire_man:

Is it a problem peculiar to Plusnet or do other ISPs have the same or similar problems?

I think it is due to the way Plusnet rate limit to line speed rather than just accept what BT is allowing through - I guess it stops systems suddenly allowing higher data rates for a period and dropping back later

Zen and AAISP do the same. I don't know about others.

The purpose is to achieve exactly what you say they should do - prevent their routers passing data to the BT Wholesale or Openreach MSAN/DSLAM at the rate received from the remote server. If they let stuff through at full whack then there could be huge packet dropping at the relevant MSAN/DSLAM if it arrives there at above the IP Profile.

Prevention of this on FTTC is a requirement stated in SIN 498. I assume BT Wholesale specify the same somewhere for ADSLx.

Regarding the OP's problem, the Plusnet Current line Speed is only updated two or three times a day anyway, so there is often a delay of a few hours for it to reflect the IP Profile. That may or may not have been a factor here - I don't think we know the time span between the upgrade and the OP.